statistics 2

Given the following set of numbers, X1 = 2, X2 = 4, X3 = 6, X4 = 10, what is the value of X42?

100

6 + 4x3 - 1 simplified is _______.

17

Given the data X1 = 1, X2 = 4, X3 = 5, X4 = 8, X5 = 10, evaluate mc010-1.jpg.

17

Given the following set of numbers, X1 = 2, X2 = 4, X3 = 6, X4 = 10, what is the value of (∑X)2?

484

If IQ was measured on a ratio scale, and John had an IQ of 40 and Fred an IQ of 80, it would be correct to say that Fred was twice as intelligent as John.

TRUE

For X + Y = Z, X equals _______.

Z - Y

Number of bar presses is an example of a(n) _______ variable.

discrete

All scales possess magnitude, equal intervals between adjacent units, and an absolute zero point.

false

Most scales used for measuring psychological variables are either ratio or interval.

false

S X2 and (S X)2 generally yield the same answer.

false

When a weight is measured to 1/1000th of a gram, that measure is absolutely accurate.

false

With the exception of division, one can perform all mathematical operations on a ratio scale.

false

A nutritionist uses a scale that measures weight to the nearest 0.01 grams. A slice of cheese weighs 0.35 grams on the scale. The true weight of the cheese _________.

may be anywhere in the range 0.345-0.355 grams

Sex of children is an example of a(n) _________ scale.

nominal

If an investigator determines that Carlo's score is five times as large as the score of Juan, the measuring scale used must have been a(an)_______ scale.

ratio

A discrete variable requires nominal or interval scaling.

true

In a race, Sam came in first and Fred second. Determining the difference in time to complete the race between Sam and Fred involves an ordinal scale

true

Measurement is always approximate with a continuous variable.

true

X6/X2 equals _______.

x3