Mathematics, 19.11.2019 06:31 jaretktm2449
A95% confidence interval for the mean reading achievement score for a population of third grade students is (44.2, 54.2). suppose you compute a 99% confidence interval using the same information. which of the following statements is correct? a. the intervals have the same width. b. the 99% interval is longer. c. the 99% interval is shorter. d. none of the above.
Answers: 2
, where 
is the sample mean , 
is the population standard deviation , n is the sample size and 
is the two-tailed test value for z.
.
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