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L15.2082 - Statistics for Business and Economics (2024/2025)

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A random experiment gave rise to the two-way contingency table shown.

Events L and R are:

Neither independent nor mutually exclusive

Independent and mutually exclusive

Independent

Mutually exclusive

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Consider the histogram depicted below:

Which boxplot depicts the same data as the histogram?

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Consider the frequency table below displaying the number of parking tickets that a random sample of 115 individuals got in the last month.


0	82
1	24
2	9

Knowing that the sample mean is 0.365, what is the mean absolute deviation? Present you result with two decimal values.

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Consider the histogram depicted below:

Which boxplot depicts the same data as the histogram?

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An economist calculated the variance of monthly household expenses in a city as 10,000.

How should this value be interpreted?

Monthly household expenses in the city typically differ by around 10,000 euros from the average.

The average household spends 10,000 euros more or less than the mean.

None of the options is correct.

This value measures variability, but it cannot be directly interpreted in its current form.

The variability in household expenses is very high.

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A professional certification exam has two independent parts: a multiple-choice section and a case study section. Suppose 30% of candidates fail the multiple-choice section, 18% fail the case study section, and 7% fail both.

If a candidate is randomly chosen, what is the probability that this candidate fails at least one of the sections?

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An online retailer conducted an A/B test, randomly assigning website visitors to see either a red or blue checkout button. Visitors who saw the red button were more likely to complete their purchase. The test was conducted during the Christmas season.

We can conclude that:

The conclusions are causal but do not generalize to the population of interest.

The conclusions are correlational and do not generalize to the population of interest.

The conclusions are causal and generalize to the population of interest.

The conclusions are correlational and generalize to the population of interest.

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A quality control inspector measures the length of 12 machine parts. The adjusted sample variance of the lengths is 49. What is the unadjusted sample variance?

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Public health researchers study the effect of vaccination campaigns on disease outbreaks by analyzing infection rates across different regions in Africa.

What is the unit of analysis in this study?

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