Question

Using the simple random sample of weights of women from a data set, we obtain these sample statistics: nequals40 and x overbarequals153.03 lb. Research from other sources suggests that the population of weights of women has a standard deviation given by sigmaequals30.91 lb. a. Find the best point estimate of the mean weight of all women. b. Find a 90% confidence interval estimate of the mean weight of all women. Click here to view a t distribution table. LOADING... Click here to view page 1 of the standard normal distribution table. LOADING... Click here to view page 2 of the standard normal distribution table. LOADING...

a. The best point estimate is nothing lb. (Type an integer or a decimal.)

b. The 90% confidence interval estimate is nothing lbless thanmuless than nothing lb.

Answer #1

a)

Point estimate = = 153.03

b)

90% confidence interval for is

- Z * / sqrt(n) < < + Z * / sqrt(n)

153.03 - 1.645 * 30.91 / sqrt(40) < < 153.03 + 1.645 * 30.91 / sqrt(40)

**144.99 < <
161.07**

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