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STA1010 - Statistical methods for science - S2 2025
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Find the necessary sample size.Weights of women in one age group are normally distributed with a standard deviation of 10.43 kg. A researcher wishes to estimate the mean weight of all women in this age group.
Find how large a sample must be drawn in order to be 95% confident (use z=2) that the sample mean will not differ from the population mean by more than 1.30 kg.
Use the given sample data to construct the indicated confidence interval for the population mean.The principal randomly selected six students to take an aptitude test. Their scores were:
71.6, 81.0, 88.9, 80.4, 78.1, 72.0
Determine a 95% confidence interval for the mean score for all students.
To calculate a 90% confidence interval for a mean, from a sample of 26 data values, the required t-value for the multiplier would be
Use the given sample data to construct the indicated confidence interval for the population mean.n = 12, x_= 28.0, s = 5.7Find a 99% confidence interval for the mean.
Based on a sample of 30 randomly selected years, a 90% confidence interval for the mean annual precipitation in one city is
from 123.7 cm to 129.5 cm
Determine the margin of error involved in this confidence interval.
To calculate a 95% confidence interval for a mean, using a sample of 10 data values, the required t-multiplier, correct to 3 decimal places, would be
Which of the following statements is the most accurate interpretation of the following confidence interval.Analysis of a random sample of 250 nurses in Victoria produced a 95% confidence interval for the mean annual salary of nurses as
In a standard Normal model, state what value(s) of z cuts off the described region:the highest 7%