A random sample of 35 Hollywood movies made in the last 10 years had a mean length of 125.2 minutes, with a standard deviation of 20.4 minutes. a. Calculate the degrees of freedom. b. Construct a 90% confidence interval for the true mean length of all Hollywood movies made in the last 10 years. (Provide the answer with 2 decimal places). <µ<

MATLAB: An Introduction with Applications
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Please answer A and B. 

A random sample of 35 Hollywood movies made in the last 10 years had a mean length of 125.2 minutes, with a standard deviation
of 20.4 minutes.
a. Calculate the degrees of freedom.
b. Construct a 90% confidence interval for the true mean length of all Hollywood movies made in the last 10
years.
(Provide the answer with 2 decimal places).
Transcribed Image Text:A random sample of 35 Hollywood movies made in the last 10 years had a mean length of 125.2 minutes, with a standard deviation of 20.4 minutes. a. Calculate the degrees of freedom. b. Construct a 90% confidence interval for the true mean length of all Hollywood movies made in the last 10 years. (Provide the answer with 2 decimal places).
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