Quiz about Review STAT205

Question 1

What is the MODE of a data set?

Accepted Answer

The number that occurs most frequently

Answer

The middle value

Answer

The average

Answer

The difference between the max and min values

Question 2

What is the MEDIAN of a data set?

Accepted Answer

The middle value

Answer

The average

Answer

The number that occurs most frequently

Answer

The difference between the max and min values

Question 3

What does it mean for a graph of data to be SKEWED RIGHT?

Accepted Answer

Most of the data is grouped to the left side

Answer

Most of the data is grouped to the right side

Answer

Most of the data is in the middle(draw a line down the middle and both sides look the same)

Question 4

Which measure of central tendency best represents this data?

Accepted Answer

Median

Answer

Mean

Answer

Mode

Answer

Range

Question 5

Which class has the lower median?

Accepted Answer

1st period

Answer

2nd period

Answer

They have the same median

Question 6

What percent of the data is between 25 and 30 on the number line?

Accepted Answer

25%

Answer

50%

Answer

75%

Answer

100%

Question 7

What does the standard deviation tell us about the data set?

Accepted Answer

How spread out the numbers are

Answer

How much each number in the data set decreases by

Answer

How much each number in the data set increases by

Question 8

Which of the following indicates a statistical association in which higher scores on one variable are associated with higher scores on the other variable?

Accepted Answer

Positive correlation

Answer

Negative correlation

Answer

No correlation

Answer

Correlation coefficient

Question 9

If the two variables are not related, a correlation coefficient near ------ will be obtained.

Accepted Answer

0.00

Answer

0.01

Answer

0.05

Answer

1.00

Question 10

What is the purpose of z-scores?

Accepted Answer

to describe where you are in relation to the mean

Answer

to describe the shape of the distribution

Answer

to find the mean of the distribution

Answer

to find the standard deviation of the distribution

Question 11

The sign of the z-score indicates whether the location is above(positive) or below(negative) the mean.

Accepted Answer

True

Answer

False

Question 12

Adam's Z-score on a test is 2.50. What does this mean?

Accepted Answer

He scored 2.5 standard deviations above the average.

Answer

Adam's score has a 2.5% chance of being better than any other randomly selected score

Answer

Adam's test score was better than 25% of his peers.

Answer

He did terrible.

Question 13

Find the value for P(Z > 1.78) using a standard normal distribution.

Accepted Answer

0.0375

Answer

0.962

Answer

0.08

Question 14

Find the value for P(0 < Z < 1.5 ) using a standard normal distribution.

Accepted Answer

0.43319

Answer

0.06681

Answer

0.93319

Answer

0.56681

Question 15

What is the total area under the curve?

Accepted Answer

1

Answer

.9998

Answer

.9997

Answer

0.5

Question 16

It is estimated that 92% of students in Australia own a mobile phone. Two students are chosen at random. What is the probability that neither of them owns a mobile phone?

Accepted Answer

0.0064

Answer

0.16

Answer

0.016

Answer

0.064

Question 17

At a local high school, GPA's are normally distributed with a mean of 2.9 and standard deviation of 0.6. What percentage of students at the high school have a GPA between 2.3 and 3.5?

Accepted Answer

68%

Answer

99.7%

Answer

84%

Answer

95%

Question 18

A P-value indicates:

Accepted Answer

the probability of obtaining the observed results (or more extreme) if the null hypothesis is true

Answer

the probability that the null hypothesis is true

Answer

probability of type I error

Answer

the probability that the alternative hypothesis is true

Question 19

Suppose the P-value for a hypothesis test is 0.0304. Using a = 0.05, what is the appropriate conclusion?

Accepted Answer

reject the null

Answer

Accept the null

Answer

reject the alternative

Answer

Fail to reject the alternative

Question 20

When performing a test about the population proportion, what distribution would you need to use?

Accepted Answer

z-distribution

Answer

t-distribution

Answer

chi-square distribution

Answer

uniform distribution

Question 21

A level of significance of 5% means:

Accepted Answer

There's a 5% chance we'll be wrong if we reject the null hypothesis.

Answer

There's a 5% chance we're wrong

Answer

There's a 5% chance we'll be wrong if we fail to reject the null hypothesis

Answer

There's a 5% chance you'll get an A on the test.

Question 22

In reality, the null hypothesis may or may not be true, and a decision is made to reject or not to reject it on the basis of the data obtained from a sample.

Accepted Answer

True

Answer

False

Review STAT205

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