Chapter 11: Q.38 (page 656)
value:
The value is zero.
Given data:
The formula, as shown below, can be used to determine the p value in an excel sheet.
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Suppose that thirty-year-olds were surveyed to determine whether or not there is a relationship between the level of education an individual has and salary. Conduct a test of independence
The Insurance Institute for Highway Safety collects safety information about all types of cars every year, and publishes a report of Top Safety Picks among all cars, makes, and models. Table 11.58 presents the number of Top Safety Picks in six-car categories for the two years 2009 and 2013. Analyze the table data to conclude whether the distribution of cars that earned the Top Safety Picks safety award has remained the same between 2009 and 2013. Derive your results at the 5%
significance level.
Isabella, an accomplished Bay to Breakers runner, claims that the standard deviation for her time to run the mile race is at most three minutes. To test her claim, Rupinder looks up five of her race times. They are minutes, minutes, minutes, minutes, and minutes.
The standard deviation of heights for students in a school is . A random sample of students is taken, and the standard deviation of heights of the sample is . A researcher in charge of the study believes the standard deviation of heights for the school is greater than .
To find the value of.
Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average delay is so consistent that the variance is no more than 150 minutes. Doubting the consistency part of the claim, a disgruntled traveler calculates the delays for his next 25 flights. The average delay for those 25 flights is 22 minutes with a standard deviation of 15 minutes.
How did you know to test the variance instead of the mean?
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