Sampling for Means

These symbols represent the mean and standard deviation for which of the following distributions?

• The Population
• The Sample
• The Sampling Distribution

These symbols represent the mean and standard deviation for which of the following distributions?

• The Population
• The Sample
• The Sampling Distribution

These symbols represent the mean and standard deviation for which of the following distributions?

• The Population
• The Sample
• The Sampling Distribution

The mean and standard deviation of a population are 200 and 20, respectively. Sample size is 25. 
What is the mean of the sampling distribution?

• 200
• 16
• 25
• 4

The mean and standard deviation of a population are 200 and 20, respectively. Sample size is 25. 
What is the standard deviation of the sampling distribution?

• 200
• 16
• 25
• 4

The average cost for a gallon of gasoline is $2.51 (source AAA.org) with a standard deviation of $0.42. These prices are strongly right-skewed. What is the shape of the sampling distribution if n = 49?

• Strongly Right Skewed

• Approximately Normal

• Roughly Uniform

• Strongly left skewed

The mean weight of potato chip bags is 10.5 ounces with a standard deviation of 3 ounces. A random sample of 40 bags of potato chips is selected. What is the probability that the mean of the sample is less than 10 ounces?

• P = -1.05

• P = .146

• P = .020

• P = .853

The mean distance an OHS student travels to school is 5.6 miles with a standard deviation of 1.7 miles. Mrs. McLemore finds the mean of her 4th period class - a randomly selected sample of 29 students. What is the probability that the mean of her class is more than 6 miles?

• P = 0.00

• P = 0.103

• P = 0.898

• P = 1.27

The mean and standard deviation of a population are 200 and 20, respectively.

What is the probability of selecting one data value less than 190?

• 0.697

• 0.420

• 0.309

• 0.581

The mean and standard deviation of a population are 200 and 20, respectively.

What is the probability of selecting 25 data values with a mean less than 190?

• 0.994

• 0.006

• 0.309

• 1