Module 4 Quiz.docx - Question 1 1 1 point Construct the...

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Question 1 1 / 1 point Construct the requested confidence interval. In a random sample of 60 computers, the mean repair cost was \$150 with a standard deviation of \$36. Construct a 90% confidence interval for the population mean. (\$537, \$654) (\$138, \$162) (\$141, \$159) (\$142, \$158)
Question 2 1 / 1 point Select the most appropriate response. What will happen (other things being equal) if you decrease the confidence level for a given confidence interval?
Question 3 1 / 1 point Construct the requested confidence interval. In a recent study of 42 eighth graders, the mean number of hours per week that they watched television was 19.6 with a standard deviation of 5.8 hours. Construct a 98% confidence interval for the population mean.
Question 4 1 / 1 point Interpret the confidence interval. An experiment was conducted to estimate the average fat content of a quarter pounder with cheese. A random sample of 30 burgers produced a sample mean of 26 grams which resulted in a 95% confidence interval of ( 25 , 27) grams. Which of the following is the correct interpretation of this interval?
Question 5 1 / 1 point Select the most appropriate response. In a random sample of 28 families, the average weekly food expense was \$95.60 with a standard
deviation of \$22.50. Determine whether a normal distribution or a t-distribution should be used or whether neither of these can be used to construct a confidence interval. Assume the distribution of weekly food expenses is normally shaped. Cannot use normal distribution or t-distribution. Use the t-distribution. Use normal distribution. Question 6 1 / 1 point Construct the requested confidence interval. A random sample of 10 parking meters in a beach community showed the following incomes for a day. Assume the incomes are normally distributed. \$3.60 \$4.50 \$2.80 \$6.30 \$2.60 \$5.20 \$6.75 \$4.25 \$8.00 \$3.00 Construct a 95% confidence interval for the true mean.
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