Statistics

Question 1

_
X

Answer 1

sample mean

Question 2

• ^p

Answer 2

sample proportion

Question 3

μ

Answer 3

population mean

Question 4

p

Answer 4

population proportion

Question 5

What are the characteristics of normal distribution?

Answer 5

• somewhat or is symmetrical
• one maximum value
• bell curve shape

Question 6

How does variability affect standard deviation?

Answer 6

More variability leads to a greater standard deviation.

Question 7

What are the empirical rule numbers?

Answer 7

• 68
• 95
• 99.7

Question 8

Wha is the lowest standard deviation number?

Answer 8

0

Question 9

σ

Answer 9

Standard deviation of a population

Question 10

How do you use normalcdf?

Answer 10

(Lower bound, upper bound, mean, standard deviation)

Question 11

How do you calculate the z-score?

Answer 11

z = (x - μ) / σ

Question 12

What does the z-score tell us?

Answer 12

How far away from the mean, in terms of standard deviation, a data point lies at.

Question 13

How do you calculate the margin of error?

Answer 13

+ or - 2 standard deviation from the mean

Question 14

How do you calculate the 95% confidence interval?

Answer 14

x-bar + or - 2σ

Question 15

How do you know if a data point is statistically significant?

Answer 15

If the data point lies outside of 2σ of the mean.
The z-score will be greater than 2 or less than -2

Question 16

N vs n

Answer 16

N = size of a population
n = size of a sample

Question 17

μ vs x-bar

Answer 17

μ = population mean
x-bar = sample mean

Question 18

σ vs s

Answer 18

σ = standard deviation of a population
s = standard deviation of a sample

Question 19

What is x-bar with an underscore of x?

Answer 19

The mean of all data points

Question 20

What does σ with an underscore of x mean?

Answer 20

The standard deviation of all data points