Construct and Interpret a Confidence Interval for a Pop Mean $\sigma = 5.7$

question 85

Short Answer

Construct and Interpret a Confidence Interval for a Pop Mean, Assuming that the Pop Std Dev is Known
-In a recent study of 86 eighth graders, the mean number of hours per week that they played video games was 21.6. Assume $\sigma = 5.7$ hours.
a) Compute the $90 \%$ confidence interval for $\mu$ .
b) If the standard deviation is doubled to $11.4$ , what will be the effect on the confidence interval?

---

Definitions:

Trust

The firm belief in the reliability, truth, ability, or strength of someone or something.

Mistrust

The feeling or belief that someone is not reliable, trustworthy, or credible.

Psychosocial Stages

Erikson’s eight developmental stages for the entire life span; each is defined by a conflict that must be resolved satisfactorily for healthy personality development to occur.

Lifespan

The maximum duration of life that an organism can theoretically achieve under optimal conditions.