What is the symbol for Population Standard Deviation?

• $\alpha$

• $\mu$

• $\sigma$

• $s$

What is the symbol for Sample Standard Deviation?

• $\alpha$

• $\mu$

• $\sigma$

• $s$

What is the symbol for Population Mean?

• $\alpha$

• $\mu$

• $\sigma$

•  $\frac{ }{x}$  

What is the symbol for Sample Mean?

• $\alpha$

• $\mu$

• $\sigma$

•  $\frac{ }{x}$  

The average number of ad clicks per day for Facebook before was 192,000 and the standard deviation was 100,000. Sixty-four (64) days after the redesign, the mean number of ad clicks per day was 200,000.

What is the  $\mu$  value?

• 64

• 100,000

• 192,000

• 200,000

The average number of ad clicks per day for Facebook before was 192,000 and the standard deviation was 100,000. Sixty-four (64) days after the redesign, the mean number of ad clicks per day was 200,000.

What is the  $\sigma$  value?

• 64

• 100,000

• 192,000

• 200,000

The average number of ad clicks per day for Facebook before was 192,000 and the standard deviation was 100,000. Sixty-four (64) days after the redesign, the mean number of ad clicks per day was 200,000.

What is the  $n$  value?

• 64

• 100,000

• 192,000

• 200,000

The average number of ad clicks per day for Facebook before was 192,000 and the standard deviation was 100,000. Sixty-four (64) days after the redesign, the mean number of ad clicks per day was 200,000.

What is the  $\overline{x}$  value?

• 64

• 100,000

• 192,000

• 200,000

1.   The mean number of close friends for the population of people living in the Philippines is 5. The standard deviation of scores in this population is 1.2. An investigator predicts that the mean number of close friends for introverts will be significantly different from the mean of the population. The mean number of close friends for a sample of 26 introverts is 6.

What is the sample mean?

• 1.2

• 5

• 6

• 26

1.   The mean number of close friends for the population of people living in the Philippines is 5. The standard deviation of scores in this population is 1.2. An investigator predicts that the mean number of close friends for introverts will be significantly different from the mean of the population. The mean number of close friends for a sample of 26 introverts is 6.

What is the sample number?

• 1.2

• 5

• 6

• 26