Question

question 9
a study was conducted to estimate μ, the mean number of weekly hours that u.s. adults use computers at home. suppose a random sample of 81 u.s. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard deviation is assumed to be σ = 3.6 hours. based on this information, what would be the point estimate for μ?
a. 3.6
b. 8.5
c. 2.36
d. 81
question 10

Explanation:

Step1: Recall point - estimate concept

The point - estimate of the population mean $\mu$ is the sample mean $\bar{x}$.

Step2: Identify sample mean

Given that the sample mean weekly computer usage time $\bar{x}=8.5$ hours.

Answer:

B. 8.5