Question 3 complete mark 700 out of 1000 flag

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Question Complete Mark 7.00 out of 10.00 Flag question Question text Question 3 (10 points) The average sales per store of ABC Inc.’s best-selling product in a supermarket chain last year was $12,000. A random sample of 61 stores selected from the chain shows that this year the average sales per store is $13,500 with a sample standard deviation of $12,000. Determine whether there has been a significant increase in the average sales per store. 1. State the null and alternative hypotheses to be tested. (2 points) 3
2. Compute the test statistic. (2 points) 3. Determine the critical value for this test at the 0.05 level of significance. (2 points) 4. What do you conclude? (2 points) 5. Construct a 95% confidence interval for the average sales per store. (2 points)
Question 4 Complete Mark 8.00 out of 8.00
Flag question Question text Question 4 (8 points) Five hundred randomly selected automobile owners were questioned about the main reason they had purchased their current automobile. The results are given below. Stylin g Engineerin g Fuel Econom y Tota l Male 70 130 150 350 Femal e 30 20 100 150 Total 100 150 250 500 1. State the null and alternative hypotheses for a contingency table test to see whether the main reason for purchase is independent of the gender of the purchaser. (2 points) 2. State the decision rule for the critical value approach. Let alpha = 0.01. (2 points) 3. Calculate the expected frequency for the cell “Male” and “Engineering.” (2 points) 4. If the Chi Square statistic is 31.746 what is your conclusion? (2 points)
The decision rule for the critical value approach is “reject the null hypothesis when observed Chi-square test statistic >9.210”

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