6:43 PM Sat Jan 25

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Standard Deviation Is Not Known Quiz

Trey Rice is taking this assessment.

This assessment was assigned 0 points by Barry Weliver. Once taken, the actual score will be used instead.

1. A simple random sample has a sample size of n = 65. Given the population is normally distributed, find (1 point)

the critical value ta/2 corresponding to a 99% confidence level.

O2.678

O 2.575

O 2.000

2.660

2. The standard deviation of sample size of n = 15 is 345 and the mean is 6784. Given that the population

(1 point)

follows a normal distribution, construct a 90% confidence interval estimate of the mean of the

population.

O 6519 < M < 7049

O 6593 < M < 6975

6627 < M < 6941

O 6783 < M < 6785

3 . Ther

sample size n = 35 is 1860. The standard deviation of the sample is 102 and the population (1 point)