The owner of a food store was concerned about her sales of a yogurt. To help boost sales, she decided to place the product on a different shelf. She kept track of sales (number of containers sold per week) for six months after she made the change. The values are in a stem-and-leaf display, along with the sales numbers for the six months prior to making the change. Do these results suggest that sales are better after the change? Test an appropriate hypothesis and state your conclusion. Be sure to check assumptions and conditions. Assume α=0.05. Click the icon to view the stem-and-leaf displays. Are the assumptions satisfied? OA. Yes, the assumptions are satisfied because the data values are independent and the data are appropriately paired. OB. Yes, the assumptions are satisfied because the data are approximately normal. OC. No, the assumptions are not satisfied because the data are approximately normal. D. No, the assumptions are not satisfied because the data are not a random sample, but they may be representative and sufficient to answer the owner's question. E. Yes, the assumptions are satisfied because the experiment was randomized, so it can be assumed that the data values are independent and the two groups are independent. What are the hypotheses for this test? OA. Ho: One distribution is shifted in location higher or lower than the other HA: The two samples are from the same distribution B. Ho: The two samples are from the same distribution HA: The after distribution is higher than the before distribution O C. Ho: The after distribution is lower than the before distribution HA: The two samples are from the same distribution O D. Ho: The two samples are from the same distribution HA: The two samples are not from the same distribution G Find the test statistic. (If there is no smaller group, use the after group.) T= (Type an integer or a decimal.) Stem-and-leaf displays After Change 3 4 3 6 4 133 4 55567 5 00134 5 7778 6 012 6 9 Before Change 2 55 3 000 3 588 4 1112344 4 689 5 02 5 79 6 0 Full data set O - X

The owner of a food store was concerned about her sales of a yogurt. To help boost sales, she decided to place the product on a different shelf. She kept track of sales (number of containers sold per week) for six months after she made the change. The values are in a stem-and-leaf display, along with the sales numbers for the six months prior to making the change. Do these results suggest that sales are better after the change? Test an appropriate hypothesis and state your conclusion. Be sure to check assumptions and conditions. Assume α=0.05. Click the icon to view the stem-and-leaf displays. Are the assumptions satisfied? OA. Yes, the assumptions are satisfied because the data values are independent and the data are appropriately paired. OB. Yes, the assumptions are satisfied because the data are approximately normal. OC. No, the assumptions are not satisfied because the data are approximately normal. D. No, the assumptions are not satisfied because the data are not a random sample, but they may be representative and sufficient to answer the owner's question. E. Yes, the assumptions are satisfied because the experiment was randomized, so it can be assumed that the data values are independent and the two groups are independent. What are the hypotheses for this test? OA. Ho: One distribution is shifted in location higher or lower than the other HA: The two samples are from the same distribution B. Ho: The two samples are from the same distribution HA: The after distribution is higher than the before distribution O C. Ho: The after distribution is lower than the before distribution HA: The two samples are from the same distribution O D. Ho: The two samples are from the same distribution HA: The two samples are not from the same distribution G Find the test statistic. (If there is no smaller group, use the after group.) T= (Type an integer or a decimal.) Stem-and-leaf displays After Change 3 4 3 6 4 133 4 55567 5 00134 5 7778 6 012 6 9 Before Change 2 55 3 000 3 588 4 1112344 4 689 5 02 5 79 6 0 Full data set O - X

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter4: Equations Of Linear Functions

Section4.5: Correlation And Causation

Problem 15PPS

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