An adventure company runs two obstacle courses, Fundash and Coolsprint, with similar designs. Since Fundash was built on rougher terrain, the designer of the courses suspects that the mean completion time of Fundash is greater than the mean completion time of Coolsprint. To test this, she selects 290 Fundash runners and 285 Coolsprint runners. (Consider these as independent random samples of the Fundash and Coolspring runners.) The 290 Fundash runners complete the course with a mean time of 77.5 minutes and a standard deviation of 7.1 minutes. The 285 individuals complete Coolsprint with a mean time of 76.4 minutes and a standard deviation of 6.3 minutes. Assume that the population standard deviations of the completion times can be estimated to be the sample standard deviations, since the samples that are used to compute them are quite large. At the 0.05 level of significance, is there enough evidence to support the claim that the mean completion time, u, of Fundash is greater than the mean completion time, µ, of Coolsprint? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to at least three decimal places. (If necessary, consult a list of formulas.) (a) State the null hypothesis H, and the alternative hypothesis H,. H, :0 H, :0 (b) Determine the type of test statistic to use. (Choose one) ▼ O=0 OSO O20 (c) Find the value of the test statistic. (Round to three or more decimal places.) O
An adventure company runs two obstacle courses, Fundash and Coolsprint, with similar designs. Since Fundash was built on rougher terrain, the designer of the courses suspects that the mean completion time of Fundash is greater than the mean completion time of Coolsprint. To test this, she selects 290 Fundash runners and 285 Coolsprint runners. (Consider these as independent random samples of the Fundash and Coolspring runners.) The 290 Fundash runners complete the course with a mean time of 77.5 minutes and a standard deviation of 7.1 minutes. The 285 individuals complete Coolsprint with a mean time of 76.4 minutes and a standard deviation of 6.3 minutes. Assume that the population standard deviations of the completion times can be estimated to be the sample standard deviations, since the samples that are used to compute them are quite large. At the 0.05 level of significance, is there enough evidence to support the claim that the mean completion time, u, of Fundash is greater than the mean completion time, µ, of Coolsprint? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to at least three decimal places. (If necessary, consult a list of formulas.) (a) State the null hypothesis H, and the alternative hypothesis H,. H, :0 H, :0 (b) Determine the type of test statistic to use. (Choose one) ▼ O=0 OSO O20 (c) Find the value of the test statistic. (Round to three or more decimal places.) O
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Transcribed Image Text:score, u, for Version 1 is less than the mean test score, µ,, for Version 2? Perform a one-tailed test. Then complete the parts below.
Carry your intermediate computations to at least three decimal places. (If necessary, consult a list of formulas.)
|(a) State the null hypothesis H, and the alternative hypothesis H,.
H, :0
H :|
(b) Determine the type of test statistic to use.
(Choose one) ▼
O=0
OSO
(c) Find the value of the test statistic. (Round to three or more decimal places.)
O#0
O<O
?
(d) Find the critical value at the 0.10 level of significance. (Round to three or more decimal places.)
(e) Can we support the claim that the mean test score for Version 1 is less than the mean test
score of Version 2?
O Yes
No
Transcribed Image Text:An adventure company runs two obstacle courses, Fundash and Coolsprint, with similar designs. Since Fundash was built on rougher terrain, the designer of the
courses suspects that the mean completion time of Fundash is greater than the mean completion time of Coolsprint. To test this, she selects 290 Fundash
runners and 285 Coolsprint runners. (Consider these as independent random samples of the Fundash and Coolspring runners.) The 290 Fundash runners
complete the course with a mean time of 77.5 minutes and a standard deviation of 7.1 minutes. The 285 individuals complete Coolsprint with a mean time of
76.4 minutes and a standard deviation of 6.3 minutes. Assume that the population standard deviations of the completion times can be estimated to be the
sample standard deviations, since the samples that are used to compute them are quite large. At the 0.05 level of significance, is there enough evidence to
support the claim that the mean completion time, u, of Fundash is greater than the mean completion time, u,, of Coolsprint? Perform a one-tailed test. Then
complete the parts below.
Carry your intermediate computations to at least three decimal places. (If necessary, consult a list of formulas.)
(a) State the null hypothesis H and the alternative hypothesis H,.
p
H, :0
H, :0
(b) Determine the type of test statistic to use.
(Choose one) ▼
D=0
OSO
(c) Find the value of the test statistic. (Round to three or more decimal places.)
O<O
(d) Find the p-value. (Round to three or more decimal places.)
(e) Can we support the claim that the mean completion time of Fundash is
olo
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