Answer Happy

You wish to test the following claim (H) at a significance level of a = 0.02. For the context of this problem, Hd=121 where the first data set represents a pre-test and the second data set represents a post-test. Ho: Pd = 0 Ha: Pd > 0 You believe the population of difference scores is normally distributed, but you do not know the standard deviation. You obtain pre-test and post-test samples for n = 11 subjects. The average difference (post-pre) is d = 21.7 with a standard deviation of the differences of så = 47.9. What is the critical value for this test? (Report answer accurate to three decimal places.) critical value = -2.281 What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic = The test statistic is... O in the critical region O not in the critical region This test statistic leads to a decision to... O reject the null accept the null fail to reject the null As such, the final conclusion is that... O There is sufficient evidence to warrant rejection of the claim that the mean difference of post-test from pre-test is greater than 0. There is not sufficient evidence to warrant rejection
A market research firm used a sample of individuals to rate the purchase potential of a particular product before and after the individuals saw a new, expensive television commercial about the product. The purchase potential ratings were based on a 0 to 10 scale, with higher values indicating more potential to purchase the product. You want to know if the commercial increased the mean purchase potential rating. You will test the claim at a significance level of a = 0.002. To do so, you find a sample of 40 people, you find the mean "after-before" rating to be d = 0.3 with a standard deviation of the differences of sa = 1.9. a. What is the test statistic for this sample? test statistic = b. What is the p-value for this sample? Round to 4 decimal places. p-value Round to 4 decimal places. c. The p-value is... O less than (or equal to) a O greater than a d. This test statistic leads to a decision to... O reject the null O accept the null fail to reject the null e. As such, the final conclusion is that... O There is sufficient evidence to warrant rejection of the claim that the mean 'after'- before rating is greater than 0. There is not sufficient evidence to warrant rejection of the claim that the mean 'after'- "hofora' rating ie proster than