STA

The df associated with evaluating the significance of robtare ____.

N-2

A statistic is defined as ____.

a number calculated on sample data that quantifies a characteristic of the sample

The confidence interval for the population mean is ____.

a range of values which probably contains the population mean

"Brand of soft drink" is measured on a(n) ____.

nominal scale

For X + Y = Z, X equals ____.

z-y

How many t distributions are there?

one for each value of df

At the annual sailing regatta, prizes are awarded for 1st, 2nd, 3rd, 4th, and 5th place. These "places" comprise a(n) ____.

ordinal scale

Refer to Exhibit 1-1. The average (mean) number of seizures for the 150 epileptics would be called a ____.

parameter

Refer to Exhibit 1-1. The 150 epileptics constitute a ____.

population

To avoid unknown, systematic factors that may bias the results of an experiment, the experimenter should select a ____ sample from a population and use controlled conditions.

random

Reaction time in seconds is an example of a(n) ____ scale.

ratio

The 95% confidence interval of the mean for = 13.0, s = 1.6, and N = 21 is ____.

12.27 to 13.73

Refer to Exhibit 13-1. Using α = 0.011 tail, the appropriate critical value is ____.

-2.423

If r = 0.84 and N = 5, the value of tobt for the test of the significance of r is ____.

2.68

Exhibit 2-1 X1 = 1, X2 = 4, X3 = 5, X4 = 8, X5 = 10 Given the above data of Exhibit 2-1, evaluate Σ X2.

206

Exhibit 2-1 X1 = 1, X2 = 4, X3 = 5, X4 = 8, X5 = 10 Given the above data of Exhibit 2-1, evaluate Σ X.

28

Where 3X = 9, what is the value of X?

3

When rounded to two decimal places, the number 3.175000 becomes ____.

3.18

1/X + 2/X equals ____.

3/x

Refer to Exhibit 13-1. The df for determining tcrit = ____.

40

What are the real limits of the observation of 6 seconds (measured to the nearest second)?

5.5-6.5

Exhibit 2-1 X1 = 1, X2 = 4, X3 = 5, X4 = 8, X5 = 10 Given the data of Exhibit 2-1, evaluate (Σ X)2.

784

Refer to Exhibit 1-1. The number of seizures for each of the 150 epileptics are called ____.

Data

Refer to Exhibit 1-1. The number of seizures for each of the 20 subjects are called ____.

Data

X = Y/Z can be expressed as ____.

Y = (Z)(X)

X(Z + Y) equals ____.

ZX + YX

As N increases becomes a ____ estimate of .

better

Refer to Exhibit 1-1. The number of seizures for each subject is an example of a(n) ____.

dependent variable

For a given N, the interval that bounds the population mean at the 99% confidence level is ____ that which bounds the population mean at the 95% confidence level

greater than

When using the t test, we reject H0 ____.

if | tobt | ≥ 3| tcrit |

Refer to Exhibit 1-1. The new drug is an example of a(n) ____.

independent variable

The variable that the experimenter manipulates is called the ____.

independent variable

Refer to Exhibit 1-1. The 20 subjects constitute a ____.

sample

In inferential statistics the object is usually to generalize from a ____ to a ____.

sample; population

In acquiring knowledge the method that employs logic, reasoning and objective assessment is referred to as ____.

scientific method

Which of the following variables has been labeled with an incorrect measuring scale?

self-rating of anxiety level by students in a statistics class - ratio

Refer to Exhibit 1-1. The average (mean) number of seizures for the 20 subjects is called a ____.

statistic

Descriptive statistics are helpful in ____ and ____ raw data.

summarizing; characterizing

"Degrees of freedom" for any statistic is defined as ____.

the number of scores that are free to vary in calculating the statistic

The dependent variable in an experiment is defined as ____.

the variable the experimenter measures to determine if there is a real effect

Refer to Exhibit 13-1. The obtained value of the appropriate statistic for testing H0 is ____.

tobt = −2.07