An experiment was conducted to determine whether giving candy to dining parties resulted in greater tips. The mean tip percentages and standard deviations are given in the accompanying table along with the sample sizes. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. The summarized statistics about giving candy. No candy 21 18.53 1.52 Two candy 42 21 20.93 2.54 (a) Use a 0.01 significance level to test the claim that giving candy does result in greater tips. (b) Test statistic (Two decimal places.) (c) P-value (Three decimal places.) (d) Construct confidence interval lower bound (Round to two decimal places.) upper bound (Round to two decimal places.)

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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An experiment was conducted to determine whether giving candy to dining parties resulted in greater tips. The mean tip percentages and standard deviations are
given in the accompanying table along with the sample sizes. Assume that the two samples are independent simple random samples selected from normally
distributed populations, and do not assume that the population standard deviations are equal.
The summarized statistics about giving candy.
No candy
21
18.53
1.52
Two candy
21
20.93
2.54
(a) Use a 0.01 significance level to test the claim that giving candy does result in greater tips.
(b) Test statistic
(Two decimal places. )
(c) P-value
(Three decimal places.)
(d) Construct confidence interval
lower bound
(Round to two decimal places.)
upper bound
(Round to two decimal places.)
Transcribed Image Text:An experiment was conducted to determine whether giving candy to dining parties resulted in greater tips. The mean tip percentages and standard deviations are given in the accompanying table along with the sample sizes. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. The summarized statistics about giving candy. No candy 21 18.53 1.52 Two candy 21 20.93 2.54 (a) Use a 0.01 significance level to test the claim that giving candy does result in greater tips. (b) Test statistic (Two decimal places. ) (c) P-value (Three decimal places.) (d) Construct confidence interval lower bound (Round to two decimal places.) upper bound (Round to two decimal places.)
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