Midterm

Question 0

What does s2* represent in stats

Answer 0

Sample variance

Question 1

What does x- represent.

X with a bar

Answer 1

Sample mean

Question 2

What does s represent in stats

Answer 2

Sample standard deviation

Question 3

Range, variance, and standard deviation are measurements of

Answer 3

Variation

Question 4

What type of chart is effective in showing a linear relationship between variables

Answer 4

Scatter plot

Question 5

What has the same as the median

Answer 5

50th percentile

Question 6

Ranking professors on difficulty of their classes would be what level of measurement

Answer 6

Ordinal

Question 7

When the units between values are meaningful (such as IQ) that variable would be considered

Answer 7

Interval

Question 8

What is the difference between a ratio and interval level of measurement

Answer 8

The existence if a true zero point

Question 9

Which of the following stats is NOT given in units of the original measure

Answer 9

Variance

Question 10

If extreme values were affecting in oversize normally distributed data set (such income distribution) which measure of central tendency would best describe the data

Answer 10

Median

Question 11

Measures of variation

Answer 11

Range, standard distribution, and variance

Question 12

When there is more than one value that occurs the most often in a data set (such as 7 occurs 6 times & 8 occurs 6 times, but no other values occurs more than 5 times) the data set is

Answer 12

Bi- modal

Question 13

What is a population data

Answer 13

The data are from every individual of interest

Question 14

What is sample data

Answer 14

The data are from only some of the individuals of interest

Question 15

Which is not a level of measurement

Answer 15

Numerical

Question 16

Jimmy goes to the mall to see if he can test his theory about the effectiveness pick up lines roe getting dates. He is hoping to try his method on 50 girls do that he can determine if he is correct. What type of data is this

Answer 16

Sample

Question 17

To discover the percentage of individuals in the US who are above the age of 60, Jane acquires data from the US census what data is this

Answer 17

Population

Question 18

Which of the following levels of measurement may not always be numerical

Answer 18

Nominal

Question 19

The NCAA football AP poll uses voters’ responses (unfortunately, instead of statistics) to determine the rankings of college football teams. There may be quite a bit of variation between the ranking differences. What level of measurement is the AP poll using?

Answer 19

Ordinal

Question 20

Danny asks each participant for his or her age in his survey. What level of measurement is he using

Answer 20

Ratio

Question 21

Maria asks for the gender of each participant in her experiment. What level of measurement is she using.

Answer 21

Nominal

Question 22

Simon sends an Internet questionnaire out to 1000 participants to investigate how much they use social networks what type of study is he conducting

Answer 22

Observational

Question 23

To test her new learning method, Shamiqua sends a program to 60 students in which a random half of them will use his new method, whereas the other half will be a control group in which the participants learn on their own. What type of study is Shamiqua conducting?

Answer 23

Experimental

Question 24

What is the difference between a ratio and interval level of measurement

Answer 24

The existence of a true zero point

Question 25

What is a histogram

Answer 25

Like a bar chart but no separation between bars

Question 26

What is in central tendency

Answer 26

Mean, median, and mode

Question 27

If you were to create a table to represent the number of items in a non- overlapping classes, what type of table would you create

Answer 27

Frequency distribution

Question 28

What is a bar hart

Answer 28

A graph that will allow one to visually compare the average GPA of 3 college sport teams

Question 29

What is a scatter plot

Answer 29

Trying to use a graph to determine if there is a relationship between the number of fb friends and really iends

Question 30

What is a histogram

Answer 30

Graph if know the number of people who bought dinners that cost between 10- 20 dollars

Question 31

Which measure of variance is not standardized so that the actual number is not given units I'd the original measure

Answer 31

Variance

Question 32

Sign for sample mean

Answer 32

X- X - bar

Question 33

Sign for population mean

Answer 33

U

Question 34

Sign for standard deviation

Answer 34

S

Question 35

Sign for population standard deviation

Answer 35

P that weird p

Question 36

Sign for variance

Answer 36

S2

Question 37

Sign for sum

Answer 37

£

Question 38

A data set may have more than one

Answer 38

Mode

Question 39

What's the difference between a bar chart and a histogram

Answer 39

1) a histogram has bars that touch each other, a bar chart has bars that are separate 2) separate bar charts may represent categorically grouped data, histogram a do not

Question 40

What is the difference between a parameter and a statistic

Answer 40

A parameter is a numerical measurement describing data from a population

Question 41

Does a raw score less than the mean correspond to a positive or negative standard score.. What about a raw score greater than the mean

Answer 41

Raw scores less than the mean will have negative standard scores,,, raw scores above the mean will have positive standard scores

Question 42

Let x be a random variable with a standardized normal distribution (z- scores). Find the indicated probability. (Round your answer to 2 decimal places)." " P(x < 0) =

Answer 42

0.50