Mathematics, 27.02.2020 05:29 bartonamber4042
6. You are constructing a 90% confidence interval for a sample consisting of n = 9 values and an
unknown population standard deviation. The population appears to be very skewed. Determine
whether a margin of error should be calculated using a critical value of za/2, a critical value of ta/2, or neither.
a) a critical value of za/2
b) a critical value of ta/2
c) neither
7. The standard deviation of sample size of n = 15 is 345 and the mean is 6784. Given that the population follows a normal distribution, construct a 90% confidence interval estimate of the mean of the population.
a) 6519
b) 6593
c) 6627
d)6783
Answers: 1
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6. You are constructing a 90% confidence interval for a sample consisting of n = 9 values and an
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