Hi, this is Statistic class, can you help me to do this?

he term __________ variable refers to the variable that the researcher is trying to explain or predict.

Select one:

a. input

b. dependent

c. dichotomous

d. independent

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2

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If the sum of all percentages in a frequency distribution sums to 100%, the sum of all proportions in a frequency distribution should sum to...

Select one:

a. N.

b. 1.

c. 100.

d. 0.

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3

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In a __________the bars which represent the categories of a variable are spaced so that one bar is not directly next to another; whereas, in a __________ the bars actually touch one another.

Select one:

a. bar graph; frequency polygon

b. bar graph; histogram

c. frequency polygon; bar graph

d. histogram; bar graph

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4

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Which of the following graphic devices is most appropriate for displaying interval-ratio level data?

Select one:

a. A frequency polygon

b. A pie chart

c. A bar graph

d. A histogram

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5

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A graph showing the difference in frequencies or percentages among the categories of a nominal or an ordinal variable -- where the categories are displayed as rectangles of equal width with their height proportional to the frequency or percentage of the category -- is referred to as a

Select one:

a. frequency polygon.

b. bar graph.

c. histogram.

d. pie chart.

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6

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Which of the following measures of central tendency is sensitive to extreme scores in a distribution?

Select one:

a. Percentile

b. Mean

c. Mode

d. Median

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7

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A bimodal distribution is one that has two

Select one:

a. percentiles.

b. modes.

c. tails.

d. frequencies.

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8

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Suppose that N=28. Therefore, the position of the median is at the 14.5th case (e.g. right between the 14th and the 15th cases).

If the values for the 14th and 15th cases are 17 and 19 respectively, what is the value of the median?

Select one:

a. 18.5

b. 19.0

c. 17.0

d. 18.0

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9

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Consider the following distribution of scores: 7, 7, 9, 10, 12. What is the median for this distribution?

Select one:

a. 8.5

b. 7.0

c. 12

d. 9.0

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10

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Which measure of central tendency is the score that divides the distribution into two equal parts so that half (50%) of the cases are above and half (50%) are below it?

Select one:

a. Median

b. Percentile

c. Mode

d. Mean

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11

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In unimodal distributions, when the mode, the median, and the mean coincide or are almost identical, the distribution is

Select one:

a. positively skewed.

b. asymmetrical.

c. symmetrical.

d. negatively skewed.

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12

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Numbers that describe what is average or typical of a distribution are referred to as

Select one:

a. measures of variability.

b. frequencies.

c. bar charts.

d. measures of central tendency.

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13

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Numbers that describe diversity or dispersion in a distribution are referred to as measures of

Select one:

a. association.

b. central tendency.

c. standard deviation.

d. variability.

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14

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The quantity that is arrived at by taking the highest score minus the lowest score is referred to as the

Select one:

a. standard deviation.

b. range.

c. interquartile range.

d. variance.

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15

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If asampleis thesubsetof all cases/observations, thetotal set of cases/observationsis called the

Select one:

a.

entity.

b.

population.

c.

sample.

d. variable.

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16

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In a sample of 500 respondents, men account for 20% of all observations in the sample. What is the total number of females in the sample?

Select one:

a. 300

b. 100

c. 200

d. 400

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17

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A relative frequency obtained by dividing the frequency in each category by the total number of cases and multiplying by 100 is a...

Select one:

a. count

b. proportion

c. percentage

d. frequency

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18

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A table showing the frequency at or below each category for a variable of interest is referred to as a

Select one:

a. frequency distribution.

b. cumulative difference distribution.

c. cumulative frequency distribution.

d. difference distribution.

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19

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Using themtcarsdata set in R, what is themeanfor theWeight (wt)variable?

Select one:

a. 0.9784574

b. 6.026948

c. 3.21725

d. 20.09062

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20

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Using themtcarsdata set in R, what is thestandard deviationfor theMiles Per Gallon (mpg)variable?

Select one:

a. 1.785922

b. 19.2

c. 6.026948

d. 20.09062

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21

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A __________ states that two variables are related, a __________ is a directional statement () about that relationship.

Select one:

a. hypothesis; theory

b. theory; hypothesis

c. variable; hypothesis

d. theory; variable

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22

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A variable whose attributes classify, can be ranked, butDO NOThave equal numerical distances between values is...

Select one:

a. Ordinal

b. Interval-Ratio

c. Nominal

d. Dichotomous

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23

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Assume 85% of students get an A (90% or higher) on the exam. Theoretically, what distributionshapewould we expect from these data?

Select one:

a. Symmetrical

b. Negatively Skewed

c. Positively Skewed

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24

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Variance is equal to standard deviation squared. Why is variation in squared units?

Select one:

a. The sum of all the raw scores would be zero

b. The sum of all the deviations (numerator) would be zero

c. The sum of all the deviations (numerator) would be negative

d. The sum of all the deviations (numerator) would be one

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25

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We can use the standard deviation to divide the normal curve (bell curve/normal distribution). What percent of cases fall between -3 SDs and +3 SDs of the mean?

Select one:

a. 99.9%

b. 68%

c. 95%

d. 90%