BIOSTATS: INTRODUCTORY

Question 1

A (reliable/valid) test is the test that gives similar results on repetition.

Answer 1

RELIABLE

Question 2

The measures the number of standard deviations that separate a certain value from the mean.

Answer 2

Z score

Question 3

Among all the methods of estimating the central tendency, the (mean/median/mode) is the most sensitive to outliers.

Answer 3

Mean

Question 4

The standard deviation measures the distribution of the data around the (mean/median) .

Answer 4

Mean

Question 5

When events are (dependent/independent) , the probability of one to happen does not affect the probability of the other occurring.

Answer 5

Independent

Question 6

Coefficient of variation is obtained by dividing the by the mean.

Answer 6

standard deviation

Question 7

The (mean/median/mode) of a certain set of values is the value that is most repeated.

Answer 7

Mode

Question 8

When we say the test is (valid/precise) , this means that it measures what it is supposed to measure correctly.

Answer 8

Valid

Question 9

When numeric data is said to be (discrete/continuous) , this means that there are no intermediary values.

Answer 9

Discrete

Question 10

The (variance/range) is the result of subtracting the lower value of the data set from the highest value.

Answer 10

Range

Question 11

The curves in which most of the data is distributed near the mean, are called (leptokurtic/platykurtic) curves.

Answer 11

Leptokurtic

Question 12

The hair color of a particular population is an example of data.

Answer 12

Nominal

Question 13

(Dependent/independent) variables are usually plotted on the x-axis in various graphs.

Answer 13

Independent

Question 14

The height of a certain group of students is an example of data.

Answer 14

Ratio

Question 15

When most of the data is distributed (close to/away from) the mean, it is called a platykurtic curve.

Answer 15

Away from

Question 16

bias results from nonrandomized selection of the sample.

Answer 16

Selection

Question 17

In negatively skewed curves, the mode is (higher/lower) than the mean.

Answer 17

Higher

Question 18

Assessing the grade of pain on a scale from one to ten is an example of data.

Answer 18

Ordinal

Question 19

The square root of variance is called the .

Answer 19

Standard deviation

Question 20

mean is used to measure the rate by which the variables change over time.

Answer 20

Geometric

Question 21

The probability of having either event X or event Y can be calculated by (adding up/subtracting) the two probabilities, assuming that X and Y are mutually exclusive.

Answer 21

Adding up

Question 22

When the probability that two events will happen together at the same time is zero, they are called events.

Answer 22

Mutually exclusive

Question 23

The variable that induces changes in other variables is called the (dependent/independent) variable.

Answer 23

Independent

Question 24

Any probability must lie between zero and (value) .

Answer 24

One

Question 25

In positively skewed curves, the mode is (higher/lower) than the mean.

Answer 25

Lower

Question 26

Platykurtic curves have (increased/decreased) standard deviation.

Answer 26

Increased

Question 27

When calculating the probability that two independent events will happen together, we have to (multiply/divide) the probability of the two events.

Answer 27

Multiply

Question 28

___________ mean is the mean of a certain set of data after eliminating the extreme values.

Answer 28

Trimmed

Question 29

The (mean/median/mode) is the middle number in a range of values after arranging them numerically.

Answer 29

Median

Question 30

error results from the variability within the selected sample that does not reflect the variability within the general population.

Answer 30

Sampling

Question 31

Changing sample size (increases/decreases/has no effect on) selection bias.

Answer 31

Has no effect on

Question 32

Assessing the (mean/median/mode) is the only method for estimating the central tendency of nominal data.

Answer 32

Mode

Question 33

In ordinal data, the difference between the values is not essentially the same, that is why the (mean/median/mode) is not usually a valid representation of the central tendency.

Answer 33

Mean

Question 34

The (mean/median/mode) is the least affected by outliers when compared to other methods of expressing the central tendency.

Answer 34

Mode

Question 35

When the skew of a non-Gaussian curve is toward the left, it is called a (positively/negatively) negatively skewed curve.

Answer 35

Negatively

Question 36

data includes numeric values that do not have a true zero, thus cannot be expressed as ratios.

Answer 36

Interval

Question 37

In a (Gaussian/non-Gaussian) curve, mean, median, and mode are all equal.

Answer 37

Gaussian

Question 38

(Increasing/Decreasing) the sample size can eliminate sampling bias.

Answer 38

Increasing

Question 39

Trimmed mean is especially useful in avoiding the deceiving effect of the .

Answer 39

Outliers

Question 40

mean is used to obtain the mean of different samples and takes into consideration the size of each sample.

Answer 40

Weighted

Question 41

A curve with two peaks is called a curve.

Answer 41

Bimodal

Question 42

The mean is calculated by summing up all the values in the data set then (dividing/multiplying) by the number of these values.

Answer 42

Dividing

Question 43

mean is used to estimate the mean of multiple sets of interval data.

Answer 43

Approximate

Question 44

Categorical data includes and ordinal data.

Answer 44

Nominal

Question 45

Leptokurtic curves have (increased/decreased) standard deviation.

Answer 45

Decreased

Question 46

When numeric data is said to be (discrete/continuous) , this means that there are intermediary values.

Answer 46

Continuous