What is different about the normality requirement for a confidence interval estimate of a and the normally requirement f

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What is different about the normality requirement for a confidence interval estimate of a and the normally requirement f

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What is different about the normality requirement for a confidence interval estimate of a and the normally requirement for a confidence interval estimate of ? The normally requirement for a confidence interval estimate of than the normally requirement for a confidence interval estimate of Departures from normality have a effect on confidence intervalimates of a than on confidence intervalomates of u. That is a confidence interval estimate of robust against a departure from normally than a confidencial estimate of

-7.3.9 Question Help A simple random sample from a population with a normal distribution of 109 body temperatures has x=98.50"F and 0.67"F. Construct a 90% confidence interval estimate of the standard deviation of body temperature of all healthy humans Click the icon to view the table of Chi-Square critical (Round to two decimal places as needed)

0.15-1 Usted below are speeds (h) memured from traffic on a busy highway. This simple random sample was obtained at 3:30 PM on a weekday. Use the sample data to construct an 80% confidence interval estimate of the population standard deviation 61 65 65 56 65 53 60 59 80 68 58 67 - Click the icon to view the table of Chi-Square Orical values The confidence imerval vatimate mih<o<imun (Round to one decimal place as needed)

78 The values listed below are waiting times in minutes) of customers at two different banks At Bank A customers enter a single waiting line that foods three to for windows. At Bank B, customers may enter any one of three different lines that have formed at three teller windows. Answer the following questions, Bank A 8.4 6.6 6.7 68 7.1 7.3 7.8 7.8 Bank B 41 5.3 帶 5.8 6.3 6.8 7.7 85 93 100 Click the soon to view the table of CN-Square critical values Construct a 90% confidence interval for the population standard deviation at Bank mine sank Amin Pound to two decimal places as needed)

7.3.21 Assume that the sample is a simple random sample obtained from a normally distributed population of fight delays at an airport. Use the table below to find the minimum sample size needed to be confident that the sample ndard deviation is within 20% of the population standard deviation. A histogram of a sample of those arrival delays suggests that the distribution is skewed, not normal. How does the distribution afect the sample size? To be 95% confident that is 1% % 10% 20% 30% 40% 50% within of the value of the sample size 19.205 70 102 46 21 12 should be at least To be 1% confident that is wa 150 x 20% 3040% 0% of the We of the sample a 33.210 1.390 396 85 22 In should be at least The minimum sample sisenedes

Which of the following is NOT a property of the chi-square distribution? Choose the correct answer below. O A. The mean of the chi-square distribution is 0. B. The chi-square distribution is different for each number of degrees of freedom. C. The chi-square distribution is not symmetric. D. The values of chi-square can be zero or positive, but they cannot be negative.
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