Qiuz -DSRT734 - B04 Infer Statisitcs in Decision-Making

Question 1

The person in the Chapter 1 tour of statistics in who introduced analysis of variance was

	a.	Jerzy Neyman
	b.	Ronald Fisher
	c.	Karl Pearson
	d.	Jacob Cohen
Question 2

Data Set 1-9 Julia and Davi conducted a study of 74 fifth grade students who were randomly assigned to groups. One group listened to pop-rock music, a second heard easy-listening music, and a third heard no music. While the music (or no music) was going on, students read a short story. Later the students took a test that measured their comprehension of the short story. (The easy-listening group performed best.) The dependent variable in Data Set 1-9 is

	a.	grade level in school;
	b.	scores on the comprehension test;
	c.	what the students heard while reading the short story;
	d.	the fact that the easy-listening group did best. Question 3 The distribution not described in the text was the a. triangular curve b. rectangular curve c. bimodal curve d. bell-shaped curve

Question 4:

Your textbook’s recommendation for analyzing a data set was to use

	a.	7 steps that include rechecking data entry and calculations
	b.	9 steps that follow the nine subsections of the textbook
	c.	5 steps that mirror the development of statistics in the 20th century
	d.	3 steps that include writing a story

Question 5

A trimmed mean may be appropriate when

	a.	categorical data are analyzed
	b.	the scale of measurement is nominal
	c.	the N’s of the various means are not equal
	d.	the distribution is skewed

Question 6

The standard deviation of the height of a group of boys and girls aged 3–14 is _______ that of a group aged 13-14.

	a.	less than
	b.	equal to
	c.	greater than

Question 7

The normal distribution is a special case of a

	a.	skewed distribution
	b.	bell-shaped distribution
	c.	rectangular distribution
	d.	bimodal distribution

Question 8

The sum of squares is

	a.	SC2
	b.	S(-)2
	c.	(SC)2
	d.	X2

Question 9

Removing the extreme scores from both tails of the distribution before calculating a central tendency statistics produces a

	a.	two-tailed mean
	b.	truncated mean
	c.	re-tooled mean
	d.	trimmed mean

Question 10

A distribution of scores has this (these) feature(s).

	a.	variability
	b.	all of the other alternatives
	c.	form
	d.	central tendency

Question 11

When the word “statistics” first began to be used it referred to

	a.	political characteristics of a country such as the number of citizens and the amount of taxes collected
	b.	chance
	c.	the subdivisions of a country (states)
	d.	a method that used samples to reach conclusions about populations

Question 12

Which of the following was not described as a benefit of a course in statistics?

	a.	you are better able to communicate with others
	b.	a tool used in several disciplines is learned
	c.	conclusions may be made with certainty
	d.	you get an education in decision making

Question 13

Epistemology deals with the nature of

	a.	experience
	b.	mathematics
	c.	knowledge
	d.	reason

Question 14

Which of the following was listed as a requirement for a fairly complete understanding of a distribution?

	a.	All of the other alternatives
	b.	Weight
	c.	Normality
	d.	Variability

Question 15

In an election Smith received 30 votes, Johnson 26, Williams 29, Brown 19, Jones 17, and Miller 31. (Smith is the most common name in the U.S., followed by Johnson, etc.) What is the mode of the distribution?

	a.	31
	b.	none of the other alternatives are correct
	c.	Jones
	d.	6

Question 16

Data Set 4-7 1, 0, 5, 6 The standard deviation of the scores in Data Set 4-7 is

	a.	6.50
	b.	8.67
	c.	none of the other alternatives are correct; answer______
	d.	2.55
	e.	2.94

Question 17

Data Set 4-5 2, 4, 6, 8 Which of the following distributions is more variable than Data Set 4-5? (You should be able to answer just by eyeballing the numbers.)

	a.	none of the above
	b.	10, 11, 12, 13
	c.	3, 5, 7, 9
	d.	-2, 0, 2, 4

Question 18

According to your text, Statistics      ______ and Experimental Design ______

	a.	involves manipulation of numbers; involves the things that influence the numbers you get
	b.	involves the things that influence the numbers you get; involves the manipulation of the numbers
	c.	involves experience only; involves reason only
	d.	is quantitative; is categorical

Question 19

The situation that prompts the calculation of a weighted mean is that

	a.	the scale of measurement is not specified
	b.	the distribution is severely skewed
	c.	several samples have different N’s
	d.	the distribution has humps in both tails

Question 20

A variability statistic that does not use the value of the highest score or the lowest score is

	a.
	b.	s
	c.	the range
	d.	the interquartile range

Question 21

Data Set 4-6 -1, 3, 0, 2, 1 In Data Set 4-6 the score of 0 has a deviation score of

	a.	5
	b.	-1
	c.	1
	d.	0

Question 22

For a positively skewed curve, the usual case with continuous data is that

	a.	high scores are more frequent and the mean is larger than the median
	b.	low scores are more frequent and the mean is larger than the median
	c.	high scores are more frequent and the mean is smaller than the median
	d.	low scores are more frequent and the mean is smaller than the median

Question 23

Data Set 1-8 Kevin recruited 40 volunteers for his study, which studied the effect on a person’s trust of having grown up in a two-parent or a one-parent family. Students were recruited from General Psychology classes. Students filled out the Rempel Trust Scale and also indicated their family’s status. In Data Set 1-8 the independent variable is

	a.	where students were recruited;
	b.	score on the Rempel Trust Scale;
	c.	family’s status;
	d.	number of students recruited.

Question 24

The best estimate of the population standard deviation, calculated from a sample is

	a.	S
	b.	s
	c.
	d.	range

Question 25

In a positively skewed curve

	a.	all the scores must be positive scores
	b.	the positive scores are more numerous than the negative scores
	c.	the results came out the way the researcher hoped they would
	d.	high scores are not as frequent as low scores