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Chapter 7: Q.29 (page 429)

An unknown distribution has a mean of 25 and a standard deviation of six. Let X = one object from this distribution. What is the sample size if the standard deviation of 危X is 42?

Short Answer

Expert verified

The sample size is49.

Step by step solution

01

Given Information

An unknown distribution has a mean of 25 and a standard deviation of six.

02

Explanation

The sample size if the standard deviation of 危X=n蟽x

Therefore, the sample size is:

42=n脳6

n=426

role="math" localid="1648890741186" n=7

n=49

Therefore, the sample size is49

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Most popular questions from this chapter

70. Which of the following is NOT TRUE about the distribution for averages?

a. The mean, median, and mode are equal.

b. The area under the curve is one.

c. The curve never touches the x-axis.

d. The curve is skewed to the right.

Suppose in a local Kindergarten through 12thgrade (K-12)school district, 53percent of the population favor a charter school for grades K through five. A simple random sample of 300 is surveyed. Calculate following using the normal approximation to the binomial distribtion.

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e. Find the probability that exactly 150favor a charter school for grades Kthrough 5.

If you have access to an appropriate calculator or computer software, try calculating these probabilities using the technology.

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