1. Which of the following do not reflect the need for statistical sampling? A. i
ID: 3236829 • Letter: 1
Question
1. Which of the following do not reflect the need for statistical sampling?
A. it may be too costly to deal with the entire population
B. it may be too difficult or cumbersome to deal with the entire population
C. it may be too time consuming to deal with the entire population
D. the analysis of the data may be destructive in nature E. none of the above
2. In finding the areas under the normal curve, if we wish to determine the area between A and B, and both A and B are greater than the mean (with A further away from the mean than B), we ?
A) we find the area below A using the positive Z table, and the area below B using the positive Z table, and add the two areas together.
B) we find the area below A using the positive Z table, and the area below B using the positive Z table, and subtract the area below A from the area below B.
C) we find the area below A using the positive Z table, and the area below B using the positive Z table, and subtract the area below B from the area below A.
D) we find the area below B using the negative Z table, and the area below A using the positive Z table, and subtract the area below B from the area below A.
3. In finding the areas under the normal curve, if we wish to determine the area below A, and A is greater than the mean, we ?
A) we find the area below A on the positive Z table and subtract it from .5000.
B) we find the area below A on the positive Z table and subtract it from 1.000.
C) the positive Z table gives us the area belowA
D) we find the area below A on the negative Z table
4. In constructing a confidence interval estimate of the population mean you decide to select 49 random observations to get your point estimate of the mean (sample mean). Your friend is also constructing a similar confidence interval estimate but decides to use a sample size of 36 random observations. Which of the following is true?
A. Your our friend’s confidence interval estimate has a greater degree of confidence.
B. Your confidence interval estimate has a greater degree of confidence.
C. Your confidence interval estimate is narrower.
D. Your confidence interval estimate is wider.
Explanation / Answer
1)
The analysis of the data may be destructive in nature
Answer is (D)
----------------------------------------------------------------------------------------------------------------------------------------------------------------------(2)
In finding the areas under the normal curve, if we wish to determine the area between A and B, and both A and B are greater than the mean (with A further away from the mean than B)
Answer is (C)
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(3)
In finding the areas under the normal curve, if we wish to determine the area below A, and A is greater than the mean, then
Answer is (C)
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(4)
Since we have more no. of random observations than our friend, so
Answer is (B)
Our confidence interval estimate has a greater degree of confidence
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