Question

A personnel manager has found that, historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 22.91 points. A random sample of 16 test scores from the current group of applicants had a mean score of 74.02 points. Based on these sample results, a statistician found for the population mean a confidence interval extending from 65.0851 to 82.9549 points. Find the confidence level of this interval. Round off your answer to two decimal places.

I am trying to work through this solution in rstudio but am unsure how to go about it. I have worked through confidence interval problems where I find a confidence interval, but am having trouble figuring out how to work backwards from this.

Answer #1

A personnel manager has found that, historically, the scores on
aptitude tests given to applicants for entry-level positions follow
a normal distribution with standard deviation 25.34 points. A
random sample of 15 test scores from the current group of
applicants had a mean score of 69.33 points. Based on these sample
results, a statistician found for the population mean a confidence
interval extending from 57.4876 to 81.1724 points. Find the
confidence level of this interval. Round off your answer to...

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Estimate with 91% confidence the mean number of rounds played
per year by physicians, assuming that the population is normally
distributed with a standard deviation of 7.
B) A personnel manager has found that, historically, the scores
on aptitude tests given to applicants for entry-level positions
follow a normal distribution with standard deviation 23.35 points....

A professor found that historically, the scores on the final
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A.
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B.
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C.
[ 166.73, 209.07]
D.
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Using the model proposed by Lafley and Charan, analyze how
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case:
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APIGEE: PEOPLE MANAGEMENT PRACTICES AND THE CHALLENGE OF
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The Business Case for Agility
“The battle is not always to the strongest, nor the
race to the swiftest, but that’s the way to bet
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In This Chapter
This chapter discusses the business case for Agility,
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