Question

The accompanying table contains the service ratings of 14 different Internet and TV providers. Complete parts​ (a) through​ (d) below.

69277 76777665767566 9395413544 66677665767566 164 12345678901234 a. At the 0.10 level of significance, is there evidence of a difference in the mean service rating between TV and Internet services? Let μ 1 be the mean TV service rating and let μ2 be the mean Internet service rating State the null and alternative hypotheses. Choose the correct answer below B. Ho Ho #0 (where μο-μι-μ2) The test statistic is tSTAT Type an integer or a decimal. Round to two decimal places as needed.) The p-value is Type an integer or a decimal. Round to three decimal places as needed.) Since the p-value is less than the value of α, reject Ho. There is sufficient evidence of a difference in the mean measurements b. What assumption is necessary about the population distribution in order to perform this test? O A. It must be assumed that the distribution of the differences between the measurements is skewed B. It must be assumed that the distribution of the differences between the measurements is approximately normal ° C. It must be assumed that the distribution of the differences between the measurements is approximately uniform O D. No assumptions are necessary c. Use a graphical method to evaluate the validity of the assumption in (a). Construct a boxplot of the differences. Choose the correct graph below OB. A. Boxplot 10 10 10 10 10 Does the assumption needed in order to conduct the t test in (a) appear to be valid? o A. Yes, the boxplot indicates skewness B No, the boxplot indicates skewness O C. No, the boxplot is approximately symmetric. O D. Yes, the boxplot is approximately symmetric. d. Construct and interpret a 90% confidence interval estimate of the difference in the mean service rating between TV and internet services. Type integers or decimals. Round to three decimal places as needed.) Interpret this interval. Choose the correct answer below 0 A. With 90% confidence, the service ratings for both TV and Internet services fall in this interval. With 90% confidence, the difference in the mean service rating between TV and Internet services falls in the interval With 10% confidence. the difference in the mean service rating between TV and Internet services falls in the interval With 10% confidence, the mean service rating between TV and Internet services falls in this interval УВ 。C. D.

Answer 1

0.3650 G1S VO 000oom -able → Here P-value <o.o.1 oom t table (-3,484 ,-2,132

n-l og Sfa 369 C