Critical Values (It is only necessary to find the negative one) 1) Find the critical value zc that corresponds to a 94% confidence level. B) ±2.33 C) ±1.88 D) ±1.96 A) ±1.645 Construct the Confidence Interval for the mean. 2) A random sample of 150 students has a grade point average with a mean of 2.86. Assume the population standard deviation is 0.78. Construct the confidence interval for the population mean, µ, at the 98% confidence. A) (2.43, 3.79) B) (2.31, 3.88) C) (2.71, 3.01) D) (2.51, 3.53) 3) A random sample of 40 students has a mean annual earnings of $3120. Assume the population standard deviation is $677. Construct the confidence interval for the population mean,µ at the 95% confidence. A) ($4812, $5342) B) ($1987, $2346) C) ($210, $110) D) ($2910, $3330) Minimum Sample size for the mean (Special formula) 4) The standard IQ test has a mean of 96 and a standard deviation of 14. We would like to know the minimum sample size needed to be 99% confident that we are within 4 IQ points of the true mean. A) 82 B) 128 C) 76 D) 41 5) In order to set rates, an insurance company is trying to estimate the number of sick days that full time workers at vear vious study indicated that the standard deviation was 3.1 days ants to be 97%.confident that the frue mean differs i BY1024 C141 D146 werestrveved,150 said they own their car Find a pointeshate for p(p-hat thein 0036 and
Critical Values (It is only necessary to find the negative one) 1) Find the critical value zc that corresponds to a 94% confidence level. B) ±2.33 C) ±1.88 D) ±1.96 A) ±1.645 Construct the Confidence Interval for the mean. 2) A random sample of 150 students has a grade point average with a mean of 2.86. Assume the population standard deviation is 0.78. Construct the confidence interval for the population mean, µ, at the 98% confidence. A) (2.43, 3.79) B) (2.31, 3.88) C) (2.71, 3.01) D) (2.51, 3.53) 3) A random sample of 40 students has a mean annual earnings of $3120. Assume the population standard deviation is $677. Construct the confidence interval for the population mean,µ at the 95% confidence. A) ($4812, $5342) B) ($1987, $2346) C) ($210, $110) D) ($2910, $3330) Minimum Sample size for the mean (Special formula) 4) The standard IQ test has a mean of 96 and a standard deviation of 14. We would like to know the minimum sample size needed to be 99% confident that we are within 4 IQ points of the true mean. A) 82 B) 128 C) 76 D) 41 5) In order to set rates, an insurance company is trying to estimate the number of sick days that full time workers at vear vious study indicated that the standard deviation was 3.1 days ants to be 97%.confident that the frue mean differs i BY1024 C141 D146 werestrveved,150 said they own their car Find a pointeshate for p(p-hat thein 0036 and
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
Question
1,2,3,4
Transcribed Image Text:Critical Values (It is only necessary to find the negative one)
1) Find the critical value zc that corresponds to a 94% confidence level.
B) ±2.33
C) ±1.88
D) ±1.96
A) ±1.645
Construct the Confidence Interval for the mean.
2) A random sample of 150 students has a grade point average with a mean of 2.86. Assume the population standard
deviation is 0.78. Construct the confidence interval for the population mean, µ, at the 98% confidence.
A) (2.43, 3.79)
B) (2.31, 3.88)
C) (2.71, 3.01)
D) (2.51, 3.53)
3) A random sample of 40 students has a mean annual earnings of $3120. Assume the population standard deviation
is $677. Construct the confidence interval for the population mean,µ at the 95% confidence.
A) ($4812, $5342)
B) ($1987, $2346)
C) ($210, $110)
D) ($2910, $3330)
Minimum Sample size for the mean (Special formula)
4) The standard IQ test has a mean of 96 and a standard deviation of 14. We would like to know the minimum sample
size needed to be 99% confident that we are within 4 IQ points of the true mean.
A) 82
B) 128
C) 76
D) 41
5) In order to set rates, an insurance company is trying to estimate the number of sick days that full time workers at
vear
vious study indicated that the standard deviation was 3.1 days
ants to be 97%.confident that the frue mean
differs i
BY1024
C141
D146
werestrveved,150 said they own their car Find a pointeshate for p(p-hat
thein
0036
and
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