Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.34) and its Z score (score in terms of SD).
A. 68% = mean ± 1 SEm
SEm = SD/√n
B. 68% = mean ± 1 SD
1. A simple random sample of 400 students is taken at a large university. The average height of the sampled students is 68 inches and the SD is 2 inches. The distribution of heights in the sample follows the normal curve very closely.
An approximate 68% confidence for the average height of students at the university is 68 inches plus or minus ____________ inches.
Approximately 68% of the students in the sample have heights in the range 68 inches plus or minus ____________ inches.
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A simple random sample of voters is taken from the voters in a large state. Using the methods of our course, researchers construct an approximate 99% confidence interval for the percent of the state’s voters who will vote for Candidate A. The interval goes from 37.3% to 48.7%.
In the sample, the percent of voters who will vote for Candidate A
is equal to ____________%.
An approximate 95% confidence interval for the percent of the state’s voters who will vote for Candidate A goes from _________% to _________%.
In the sample, the percent of voters who will vote for Candidate A
is equal to ____________%.
An approximate 95% confidence interval for the percent of the state’s voters who will vote for Candidate A goes from _________% to _________%.
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A simple random sample of voters is taken from the voters in a large state. Using the methods of our course, researchers construct an approximate 99% confidence interval for the percent of the state’s voters who will vote for Candidate A. The interval goes from 37.3% to 48.7%.
In the sample, the percent of voters who will vote for Candidate A
is equal to ____________%.
An approximate 95% confidence interval for the percent of the state’s voters who will vote for Candidate A goes from _________% to _________%.
A simple random sample of voters is taken from the voters in a large state. Using the methods of our course, researchers construct an approximate 99% confidence interval for the percent of the state’s voters who will vote for Candidate A. The interval goes from 37.3% to 48.7%.
In the sample, the percent of voters who will vote for Candidate A
is equal to ____________%.
An approximate 95% confidence interval for the percent of the state’s voters who will vote for Candidate A goes from _________% to _________%.
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