Nancy Believes That the Average Running Time of Movies Is

question 70

Essay

Nancy believes that the average running time of movies is equal to 140 minutes.A sample of 4 movies was taken and the following running times (in minutes) were obtained.Assume the population of the running times is normally distributed. ​
a.
Compute the sample mean and the standard deviation.
b.
State the null and alternative hypotheses.
c.
Using the critical value approach, test the hypotheses at the 10% level of significance.
d.
Using the p-value approach, test the hypotheses at the 10% level of significance.

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Definitions:

Autonomic Neurons

Nerve cells that control involuntary functions of the body, such as heart rate, digestion, and respiratory rate.

Adrenal Medulla

The inner part of the adrenal gland that secretes adrenaline and noradrenaline, hormones involved in the body's stress response.

Mesoderm

The middle layer of an embryo in early development, from which most of the body's tissues and structures are derived, including muscle, bone, and the circulatory system.

Ectoderm

The outermost of the three primary germ layers in the embryo, giving rise to the nervous system, skin, and various other tissues and organs.