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# I am failing quantitative reasoning. I'm trying to teach myself and I have no clue what I'm doing.  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 &lt; M &lt; 7049
O 6593 &lt; M &lt; 6975
6627 &lt; M &lt; 6941
O 6783 &lt; M &lt; 6785
3 . Ther
sample size n = 35 is 1860. The standard deviation of the sample is 102 and the population (1 point)

1. Given that, sample size (n) = 65 Degrees of freedom = 65 - 1 = 64... View the full answer

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