A researcher believes there is a difference in the mean number of days before visible results begin to show among three types of facial creams that reduce wrinkle lines. everal consumers are randomly selected and given one of the three creams. Each participant then recorded the number of days it took to see results. The results are hown in the table. Based on these data, can you conclude that there is a difference between the mean number of days for these three creams? Use a 0.05 level of significance and assume the population distributions are approximately normal with equal population variances. Cream #1 14 10 11 12 12 Cream #2 11 11 11 20 11 Cream #3 16 17 15 21 19 14 Copy Data Step 1 of 2: Compute the value of the test statistic. Round any intermediate calculations to at least six decimal places, and round your final answer to four decimal places.
A researcher believes there is a difference in the mean number of days before visible results begin to show among three types of facial creams that reduce wrinkle lines. everal consumers are randomly selected and given one of the three creams. Each participant then recorded the number of days it took to see results. The results are hown in the table. Based on these data, can you conclude that there is a difference between the mean number of days for these three creams? Use a 0.05 level of significance and assume the population distributions are approximately normal with equal population variances. Cream #1 14 10 11 12 12 Cream #2 11 11 11 20 11 Cream #3 16 17 15 21 19 14 Copy Data Step 1 of 2: Compute the value of the test statistic. Round any intermediate calculations to at least six decimal places, and round your final answer to four decimal places.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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Step 1: See image
Step 2 of 2 : Draw a conclusion and interpret the decision.
Transcribed Image Text:A researcher believes there is a difference in the mean number of days before visible results begin to show among three types of facial creams that reduce wrinkle lines.
Several consumers are randomly selected and given one of the three creams. Each participant then recorded the number of days it took to see results. The results are
shown in the table. Based on these data, can you conclude that there is a difference between the mean number of days for these three creams? Use a 0.05 level of
significance and assume the population distributions are approximately normal with equal population variances.
Cream #1
14
10
11
12
12
Cream #2
11
11
11
20
11
Cream #3
16
17
15
21
19
14
Copy Data
Step 1 of 2: Compute the value of the test statistic. Round any intermediate calculations to at least six decimal places, and round your final answer to four decimal
places.
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