WorksheetsCW - 7.2
Total questions: 10
Worksheet time: 3hrs 30mins
Decide whether reject Ho or fail to reject Ho given the following:
Claim: u < 23; sample mean: 22; standard deviation: 2.1; n= 50; a = 0.01
reject Ho, at 1% level of significance, there is enough evidence to support the claim
fail to reject Ho, at 1% level of significance, there is no enough evidence to reject the claim
fail to reject Ho, at 1% level of significance, there is no enough evidence to support the claim
reject Ho, at 1% level of significance, there is enough evidence to reject the claim
Find the p-value for a hypothesis test with the standardized test statistic z. Decide whether you reject Ho or fail to reject Ho.
two-tailed: z = -2.45; a = 0.05
fail to reject Ho
reject Ho
none of these
Compute the value of the standardized test statistic (z-score). Round your answer to two decimal places.
You wish to test the claim that μ > 18 at a level of significance
of α=0.10 and are given sample statistics
n =45, sample mean = 19.12. Assume the population standard deviation is 2.8.
z = 2.29
z = 2.68
z = 2.87
z = 2.13
Test the claim that μ = 418, given that σ =90, α = 0.20 and the
sample mean = 415 and n = 75
reject Ho, at 20% level of significance, there is enough evidence to support the claim
fail to reject Ho, at 20% level of significance, there is not enough evidence to support the claim
fail to reject Ho, at 20% level of significance, there is not enough evidence to reject the claim
reject Ho, at 20% level of significance, there is enough evidence to reject the claim
Find the critical value and rejection region for the type of z-test with level of significance α.
left-tailed; a = 0.025
-1.960
1.960
-0.674
0.674
A fast food outlet claims that the mean waiting time in line is greater than 3.5 minutes. A random sample of 75 customers has a mean of 3.6 minutes with a population standard deviation of 0.8 minute. If α = 0.10, test the fast food outletʹs claim using critical values and rejection regions.
fail to reject Ho, at 10% level of significance, there is not enough evidence to support the claim
reject Ho, at 10% level of significance, there is enough evidence to reject the claim
reject Ho, at 10% level of significance, there is enough evidence to support the claim
fail to reject Ho, at 10% level of significance, there is not enough evidence to reject the claim
A fast food outlet claims that the mean serving time in line is 2 minutes. A random sample of 42 customers has a mean of 2.58 minutes with a population standard deviation of 1.2 minute. If α = 0.01, test the fast food outletʹs claim using critical values and rejection regions.
fail to reject Ho, at 1% level of significance, there is not enough evidence to reject the claim
reject Ho, at 1% level of significance, there is enough evidence to reject the claim
reject Ho, at 1% level of significance, there is enough evidence to support the claim
fail to reject Ho, at 1% level of significance, there is not enough evidence to support the claim
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1500 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 1480 hours with a population standard deviation of 80 hours. Test the manufacturerʹs claim. Use α = 0.20.
reject Ho, at 20% level of significance, there is enough evidence to support the claim
fail to reject Ho, at 20% level of significance, there is not enough evidence to reject the claim
reject Ho, at 20% level of significance, there is enough evidence to reject the claim
fail to reject Ho, at 20% level of significance, there is not enough evidence to support the claim
Find the critical value and rejection region for the type of z-test with level of significance α.
two-tailed; a = 0.05
−1.645
−1.960
±1.645
±1.960
Compute the value of the standardized test statistic (z-score). Round your answer to two decimal places.
You wish to test the claim that μ = 25 at a level of significance
of α=0.02 and are given sample statistics
n =45, sample mean = 26.1. Assume the population standard deviation is 4.21.
z = 1.76
z = -1.75
z = 1.75
z = -1.76
