A house cleaning service claims that it can clean a four-bedroom house in less than 2 hours. A sample of n = 36 houses is taken and the sample mean is found to be 1.97 hours and the sample standard deviation is found to be 0.1 hours. Using a 0.05 level of significance the correct conclusion is: a)  b)  c)  d)    Question 8 options:   Do not reject the null because the test statistic (-1.8) is > the critical value (- 1.96).   Reject the null because the test statistic (-1.8) is > the critical value (-1.96).   Do not reject the null because the test statistic (-1.8) is < the critical value (- 1.64).   Reject the null because the test statistic (-1.8) is < the critical value (-1.64).

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A house cleaning service claims that it can clean a four-bedroom house in less than 2 hours. A sample of n = 36 houses is taken and the sample mean is found to be 1.97 hours and the sample standard deviation is found to be 0.1 hours. Using a 0.05 level of significance the correct conclusion is: a)  b)  c)  d) 

 

Question 8 options:

 

Do not reject the null because the test statistic (-1.8) is > the critical value (- 1.96).

 

Reject the null because the test statistic (-1.8) is > the critical value (-1.96).

 

Do not reject the null because the test statistic (-1.8) is < the critical value (- 1.64).

 

Reject the null because the test statistic (-1.8) is < the critical value (-1.64).

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