Question

The ages of a group of 149 randomly selected adult females have a standard deviation of...

The ages of a group of

149

randomly selected adult females have a standard deviation of

17.5

years. Assume that the ages of female statistics students have less variation than ages of females in the general​ population, so let

sigma

equals17.5years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics​ students? Assume that we want

95

​%

confidence that the sample mean is within​ one-half year of the population mean. Does it seem reasonable to assume that the ages of female statistics students have less variation than ages of females in the general​ population?

0 0
Add a comment Improve this question Transcribed image text
Answer #1

Solution :

Z/2 = Z0.025 = 1.96  

sample size = n = [Z/2* / E] 2

n = [1.96 * 17.5 / 0.5 ]2

n = 4705.96

Sample size = n = 4706

Yes,because statistic students are typically younger than people in the general population.

Add a comment
Know the answer?
Add Answer to:
The ages of a group of 149 randomly selected adult females have a standard deviation of...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
  • The ages of a group of 126 randomly selected adult females have a standard deviation of...

    The ages of a group of 126 randomly selected adult females have a standard deviation of 16.7 years. Assume that the ages of female statistics students have less variation than ages of females in the general​ population, so let sigmaequals16.7 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics​ students? Assume that we want 90​% confidence that the sample mean is within​ one-half...

  • The ages of a group of 156156 randomly selected adult females have a standard deviation of...

    The ages of a group of 156156 randomly selected adult females have a standard deviation of 16.516.5 years. Assume that the ages of female statistics students have less variation than ages of females in the general​ population, so let sigmaσequals=16.516.5 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics​ students? Assume that we want 9898​% confidence that the sample mean is within​ one-half...

  • The ages of a group of 160 randomly selected adult females have a standard deviation of...

    The ages of a group of 160 randomly selected adult females have a standard deviation of 17.4 years. Assume that the ages of female statistics students have less variation than ages of females in the general​ population, so let sigmaequals17.4 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics​ students? Assume that we want 99​% confidence that the sample mean is within​ one-half...

  • The ages of a group of 122 randomly selected adult females have a standard deviation of...

    The ages of a group of 122 randomly selected adult females have a standard deviation of 18.5 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so let = 185 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics students? Assume that we want 98% confidence that the sample mean is within...

  • The ages of a group of 152 randomly selected adult females have a standard deviation of...

    The ages of a group of 152 randomly selected adult females have a standard deviation of 18.1 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so let o = 18.1 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics students? Assume that we want 98% confidence that the sample mean is...

  • The ages of a group of 152 randomly selected adult females have a standard deviation of...

    The ages of a group of 152 randomly selected adult females have a standard deviation of 18.5 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so leta 18.5 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics students? Assume Pat we want 90% confidence that the sample mean is within one-half...

  • The ages of a group of 147 randomly selected adult females have a standard deviation of...

    The ages of a group of 147 randomly selected adult females have a standard deviation of 18.7 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so let σ = 18.7 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics students? Assume that we want 95% confidence that the sample mean is...

  • The ages of a group of 121 randomly selected adult females have a standard deviation of...

    The ages of a group of 121 randomly selected adult females have a standard deviation of 10 years Assume that the age of fomate statistics students have less wanation than ages of females in the general population, so leta 10.9 years for the sample size calculation How many female stics student ages must be obtained in order to estimate the mean age of a female sialistics Students Assume that we want 90% confidence that the sample mean is within one-half...

  • The ages of a group of randomly selected adult females have a standard deviation of years. Assume that the ages of female statistics students have less variation than ages of females in the general​ population, so let years for the sample size calculat

    The ages of a group of 136 randomly selected adult females have a standard deviation of 16.8 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so let σ=16.8 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics students? Assume that we want 95% confidence that the sample mean is within one-half...

  • 1. In a study of speed​ dating, male subjects were asked to rate the attractiveness of their female​ dates, and a sample...

    1. In a study of speed​ dating, male subjects were asked to rate the attractiveness of their female​ dates, and a sample of the results is listed below ​(1equals=not ​attractive; 10equals=extremely ​attractive). Construct a confidence interval using a 99% confidence level. What do the results tell about the mean attractiveness ratings of the population of all adult​ females? 6​, 8​, 1​, 10​, 7​, 5​, 8​, 9​, 7​, 10​, 3​, 9 What is the confidence interval for the population mean muμ​?...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT