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Netflix claims that the mean length of American movies is 104 minutes. A film critic thinks...

Netflix claims that the mean length of American movies is 104 minutes.

A film critic thinks the movie length published by Netflix should be longer. He sets up a hypothesis test at significance level Alpha = 0.05

He samples 40 American movies. Their mean length is 126 minutes with standard deviation 15 minutes.

Part 1: what is the claim?

Part 2: what is the critical value?

Part 3: what is the test statistic?

Part 4: what is the decision?

Select one:

a. Part 1 H1  μ > 104

Part 2 the critical value(s) is 1.686*

Part 3 the test-statistic = 9.276
Part 4 there is significant evidence to reject Ho

b.
Part 1 H1  μ = 126

Part 2 the critical value(s) is 2.048*

Part 3 the test-statistic = 0.0000
Part 4 the principal fails to reject Ho

c.
Part 1 H1  μ > 126

Part 2 the critical value(s) is 1.645*

Part 3 the test-statistic = 1.0282
Part 4 the film critic fails to reject Ho

d.
Part 1 H1  μ = 104

Part 2 the critical value(s) is ±± 1.287*

Part 3 the test-statistic = 8.938
Part 4 the film critic fails to reject Ho

math   Statistics-And-Probability   
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