Parameter Change to Mean and Standard Deviation

It characterize the spread or range of a normal distribution/data set?

• Sample Mean

• Population Mean

• Standard Deviation

• Sample Size

Given the MU = 50 and SD = 12,
What is P ( X < 70 )?

• 95.15%

• 94.84%

• 95.35%

• 95.25%

Which refers to the mean of a population?

• Standard Deviation

• MU

• Statistic

• Parameter

A population has mean μ = 25 and standard deviation σ = 3.4. Find the mean and standard deviation of sampling distribution when n = 16.

• 25, 0.85

• 25, 3.4

• 6.25, 0.85

• 6.25, 3.4

If 35 was removed from the data, what would be the result?

• Mean and Standard Deviation would increase.

• Mean and Standard Deviation would decrease.

• Mean would decrease and Standard Deviation would increase.

• Mean increase and Standard Deviation would decrease.

Approximately ​ (a)   of the data lies within 2 standard deviations of the mean.​

• 95%

• 50%

• 99.7%

• 68%

Consider the dataset:
3 9 0 9 7 13
If the 13 was changed to a 6, the standard deviation would

• stay the same

• decrease

• increase

What is the standard deviation on the graph given?

Approximately ​ (a)   of the data lies within 1 standard deviation of the mean.​

• 68%

• 50%

• 99.7%

• 95%

Assume the average daily temperature for the first 30 days of March has a mean of 48 and a standard deviation of 8. If the temperature on March 31 is 62, then the standard deviation will...

• Go up

• Go down

• Stay the same