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MATH 1213 1P Fall 2025 Intro to Statistics [Room CH230]

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Consider this null hypothesis:  Children whose parents score above average in

daily stress are not more anxious than children in general.  Which of the following is the corresponding

alternative

hypothesis?

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If your hypothesis was “Students get higher

grades in afternoon classes than classes in general”, and you made a Type I

error, this means you falsely concluded

that

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Consider this alternative hypothesis: Those

involved in anti-racism activities while students are more likely to be Church

leaders as graduates.  Which of the

following is the corresponding null

hypothesis?

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Which of the following hypotheses might be

addressed with a z-

test?

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Which kinds of comparisons can you make with a

z-test and not with other

statistics?

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Which of the following is an example of a two-tailed hypothesis?

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Which of the following is an example of a

one-tailed

hypothesis?

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Craig is working with a sample of athletes who

are battling eating disorders.  To help

them appreciate how their habits compare to others, he asked them to complete a

Healthy Eating Scale on which healthy athletes typically score around 25, with

a standard deviation of 5 points.  His

sample of 9 athletes scored 17.  He wants to know the probability that a group of 9 athletes would score 17 or lower in this

distribution.  Which equation should he

use?

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Laurie ran a human resources consulting business

that helped companies hire new employees. 

One of the tests they gave to potential employees was a test of racial

prejudice.  She knew the average score on

this test was 10, with a standard deviation of 9.5.  She wants to know the probability that a person could

score as low as -10 on this test.  Which

equation should she

use?

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document.styleSheets.dynCom.addRule(".msocomtxt","border-bottom: 2pt solid threedshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-left: 1pt solid threedlightshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","padding: 3pt 3pt 3pt 3pt");

document.styleSheets.dynCom.addRule(".msocomtxt","z-index: 100");

}

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function msoCommentShow(anchor_id, com_id)

{

if(msoBrowserCheck())

{

c = document.all(com_id);

a = document.all(anchor_id);

if (null != c && null == c.length && null != a && null == a.length)

{

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while (el.tagName != "BODY")

{

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x = x + el.offsetLeft;

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if (x + cw + ah / 2 > bw + bsl && x + aw - ah / 2 - cw >= bsl )

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else

{ c.style.top = y + ah / 2; }

c.style.visibility = "visible";

} } }

function msoCommentHide(com_id)

{

if(msoBrowserCheck())

{

c = document.all(com_id);

if (null != c && null == c.length)

{

c.style.visibility = "hidden";

c.style.left = -1000;

c.style.top = -1000;

} }

}

function msoBrowserCheck()

{

ms = navigator.appVersion.indexOf("MSIE");

vers = navigator.appVersion.substring(ms + 5, ms + 6);

ie4 = (ms > 0) && (parseInt(vers) >= 4);

return ie4;

}

if (msoBrowserCheck())

{

document.styleSheets.dynCom.addRule(".msocomanchor","background: infobackground");

document.styleSheets.dynCom.addRule(".msocomoff","display: none");

document.styleSheets.dynCom.addRule(".msocomtxt","visibility: hidden");

document.styleSheets.dynCom.addRule(".msocomtxt","position: absolute");

document.styleSheets.dynCom.addRule(".msocomtxt","top: -1000");

document.styleSheets.dynCom.addRule(".msocomtxt","left: -1000");

document.styleSheets.dynCom.addRule(".msocomtxt","width: 33%");

document.styleSheets.dynCom.addRule(".msocomtxt","background: infobackground");

document.styleSheets.dynCom.addRule(".msocomtxt","color: infotext");

document.styleSheets.dynCom.addRule(".msocomtxt","border-top: 1pt solid threedlightshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-right: 2pt solid threedshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-bottom: 2pt solid threedshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-left: 1pt solid threedlightshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","padding: 3pt 3pt 3pt 3pt");

document.styleSheets.dynCom.addRule(".msocomtxt","z-index: 100");

}

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function msoCommentShow(anchor_id, com_id)

{

if(msoBrowserCheck())

{

c = document.all(com_id);

a = document.all(anchor_id);

if (null != c && null == c.length && null != a && null == a.length)

{

var cw = c.offsetWidth;

var ch = c.offsetHeight;

var aw = a.offsetWidth;

var ah = a.offsetHeight;

var x = a.offsetLeft;

var y = a.offsetTop;

var el = a;

while (el.tagName != "BODY")

{

el = el.offsetParent;

x = x + el.offsetLeft;

y = y + el.offsetTop;

}

var bw = document.body.clientWidth;

var bh = document.body.clientHeight;

var bsl = document.body.scrollLeft;

var bst = document.body.scrollTop;

if (x + cw + ah / 2 > bw + bsl && x + aw - ah / 2 - cw >= bsl )

{ c.style.left = x + aw - ah / 2 - cw; }

else

{ c.style.left = x + ah / 2; }

if (y + ch + ah / 2 > bh + bst && y + ah / 2 - ch >= bst )

{ c.style.top = y + ah / 2 - ch; }

else

{ c.style.top = y + ah / 2; }

c.style.visibility = "visible";

} } }

function msoCommentHide(com_id)

{

if(msoBrowserCheck())

{

c = document.all(com_id);

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{

c.style.visibility = "hidden";

c.style.left = -1000;

c.style.top = -1000;

} }

}

function msoBrowserCheck()

{

ms = navigator.appVersion.indexOf("MSIE");

vers = navigator.appVersion.substring(ms + 5, ms + 6);

ie4 = (ms > 0) && (parseInt(vers) >= 4);

return ie4;

}

if (msoBrowserCheck())

{

document.styleSheets.dynCom.addRule(".msocomanchor","background: infobackground");

document.styleSheets.dynCom.addRule(".msocomoff","display: none");

document.styleSheets.dynCom.addRule(".msocomtxt","visibility: hidden");

document.styleSheets.dynCom.addRule(".msocomtxt","position: absolute");

document.styleSheets.dynCom.addRule(".msocomtxt","top: -1000");

document.styleSheets.dynCom.addRule(".msocomtxt","left: -1000");

document.styleSheets.dynCom.addRule(".msocomtxt","width: 33%");

document.styleSheets.dynCom.addRule(".msocomtxt","background: infobackground");

document.styleSheets.dynCom.addRule(".msocomtxt","color: infotext");

document.styleSheets.dynCom.addRule(".msocomtxt","border-top: 1pt solid threedlightshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-right: 2pt solid threedshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-bottom: 2pt solid threedshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-left: 1pt solid threedlightshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","padding: 3pt 3pt 3pt 3pt");

document.styleSheets.dynCom.addRule(".msocomtxt","z-index: 100");

}

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function msoCommentShow(anchor_id, com_id)

{

if(msoBrowserCheck())

{

c = document.all(com_id);

a = document.all(anchor_id);

if (null != c && null == c.length && null != a && null == a.length)

{

var cw = c.offsetWidth;

var ch = c.offsetHeight;

var aw = a.offsetWidth;

var ah = a.offsetHeight;

var x = a.offsetLeft;

var y = a.offsetTop;

var el = a;

while (el.tagName != "BODY")

{

el = el.offsetParent;

x = x + el.offsetLeft;

y = y + el.offsetTop;

}

var bw = document.body.clientWidth;

var bh = document.body.clientHeight;

var bsl = document.body.scrollLeft;

var bst = document.body.scrollTop;

if (x + cw + ah / 2 > bw + bsl && x + aw - ah / 2 - cw >= bsl )

{ c.style.left = x + aw - ah / 2 - cw; }

else

{ c.style.left = x + ah / 2; }

if (y + ch + ah / 2 > bh + bst && y + ah / 2 - ch >= bst )

{ c.style.top = y + ah / 2 - ch; }

else

{ c.style.top = y + ah / 2; }

c.style.visibility = "visible";

} } }

function msoCommentHide(com_id)

{

if(msoBrowserCheck())

{

c = document.all(com_id);

if (null != c && null == c.length)

{

c.style.visibility = "hidden";

c.style.left = -1000;

c.style.top = -1000;

} }

}

function msoBrowserCheck()

{

ms = navigator.appVersion.indexOf("MSIE");

vers = navigator.appVersion.substring(ms + 5, ms + 6);

ie4 = (ms > 0) && (parseInt(vers) >= 4);

return ie4;

}

if (msoBrowserCheck())

{

document.styleSheets.dynCom.addRule(".msocomanchor","background: infobackground");

document.styleSheets.dynCom.addRule(".msocomoff","display: none");

document.styleSheets.dynCom.addRule(".msocomtxt","visibility: hidden");

document.styleSheets.dynCom.addRule(".msocomtxt","position: absolute");

document.styleSheets.dynCom.addRule(".msocomtxt","top: -1000");

document.styleSheets.dynCom.addRule(".msocomtxt","left: -1000");

document.styleSheets.dynCom.addRule(".msocomtxt","width: 33%");

document.styleSheets.dynCom.addRule(".msocomtxt","background: infobackground");

document.styleSheets.dynCom.addRule(".msocomtxt","color: infotext");

document.styleSheets.dynCom.addRule(".msocomtxt","border-top: 1pt solid threedlightshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-right: 2pt solid threedshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-bottom: 2pt solid threedshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-left: 1pt solid threedlightshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","padding: 3pt 3pt 3pt 3pt");

document.styleSheets.dynCom.addRule(".msocomtxt","z-index: 100");

}

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function msoCommentShow(anchor_id, com_id)

{

if(msoBrowserCheck())

{

c = document.all(com_id);

a = document.all(anchor_id);

if (null != c && null == c.length && null != a && null == a.length)

{

var cw = c.offsetWidth;

var ch = c.offsetHeight;

var aw = a.offsetWidth;

var ah = a.offsetHeight;

var x = a.offsetLeft;

var y = a.offsetTop;

var el = a;

while (el.tagName != "BODY")

{

el = el.offsetParent;

x = x + el.offsetLeft;

y = y + el.offsetTop;

}

var bw = document.body.clientWidth;

var bh = document.body.clientHeight;

var bsl = document.body.scrollLeft;

var bst = document.body.scrollTop;

if (x + cw + ah / 2 > bw + bsl && x + aw - ah / 2 - cw >= bsl )

{ c.style.left = x + aw - ah / 2 - cw; }

else

{ c.style.left = x + ah / 2; }

if (y + ch + ah / 2 > bh + bst && y + ah / 2 - ch >= bst )

{ c.style.top = y + ah / 2 - ch; }

else

{ c.style.top = y + ah / 2; }

c.style.visibility = "visible";

} } }

function msoCommentHide(com_id)

{

if(msoBrowserCheck())

{

c = document.all(com_id);

if (null != c && null == c.length)

{

c.style.visibility = "hidden";

c.style.left = -1000;

c.style.top = -1000;

} }

}

function msoBrowserCheck()

{

ms = navigator.appVersion.indexOf("MSIE");

vers = navigator.appVersion.substring(ms + 5, ms + 6);

ie4 = (ms > 0) && (parseInt(vers) >= 4);

return ie4;

}

if (msoBrowserCheck())

{

document.styleSheets.dynCom.addRule(".msocomanchor","background: infobackground");

document.styleSheets.dynCom.addRule(".msocomoff","display: none");

document.styleSheets.dynCom.addRule(".msocomtxt","visibility: hidden");

document.styleSheets.dynCom.addRule(".msocomtxt","position: absolute");

document.styleSheets.dynCom.addRule(".msocomtxt","top: -1000");

document.styleSheets.dynCom.addRule(".msocomtxt","left: -1000");

document.styleSheets.dynCom.addRule(".msocomtxt","width: 33%");

document.styleSheets.dynCom.addRule(".msocomtxt","background: infobackground");

document.styleSheets.dynCom.addRule(".msocomtxt","color: infotext");

document.styleSheets.dynCom.addRule(".msocomtxt","border-top: 1pt solid threedlightshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-right: 2pt solid threedshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-bottom: 2pt solid threedshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","border-left: 1pt solid threedlightshadow");

document.styleSheets.dynCom.addRule(".msocomtxt","padding: 3pt 3pt 3pt 3pt");

document.styleSheets.dynCom.addRule(".msocomtxt","z-index: 100");

}

// -->

Suppose the batting average in Joanie’s baseball

league was .305 with a standard deviation of .15.  She wanted to show that her team was

substantially better than average at bat.  She wanted to know what batting average her team of 9 players would have to attain to be in

the top 25% of this

distribution.  Which equation should she use?

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