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Exam 15: Statistical Reasoning in Everyday Life

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Question 1

Multiple Choice

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A random sample of females was observed to exhibit a lower average level of self-esteem than a random sample of males.To assess the likelihood that this observed difference reflects a real difference in the average self-esteem of the total population of males and females,you should

A) construct a scatterplot.
B) calculate a correlation coefficient.
C) plot the distribution of self-esteem levels among all males and females.
D) conduct a test of statistical significance.

E) C) and D)
F) None of the above

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D

Question 2

Multiple Choice

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If IQ scores are normally distributed,having a mean of 100 and a standard deviation of 15,approximately what percentage of people have IQ scores somewhere between 70 and 130?

A) 34
B) 50
C) 68
D) 95

E) A) and B)
F) A) and C)

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Question 3

Multiple Choice

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Although Dominick's psychology class is sometimes longer or shorter than usual,on average each class is 50 minutes.If the lengths of these classes form a normal curve,which statistic would enable Dominick to estimate the probability that any single class will last somewhere between 47 and 53 minutes?

If IQ scores are normally distributed,having a mean of 100 and a standard deviation of 15,approximately what percentage of people have IQ scores between 55 and 145?

Longer survival rates of the healthiest and most intelligent people partially account for the apparent stability of intelligence across the life span found in

Measures of central tendency are most useful for

Ahmed has five sisters who are 3,3,5,9,and 10 years of age.The number 5 represents the ________ of the sisters' ages.

Which statistical phenomenon refers to the tendency for extraordinary or unusual events to be followed by more ordinary events?

Approximately what percentage of the cases represented by the normal curve fall between -2 and +2 standard deviations from the mean?

Standard deviation is to mean as ________ is to ________.

Which measure of variation is affected most by a few extreme scores?

If a negative correlation between two sets of scores is displayed in a scatterplot,the points are clustered in a pattern that

A correlation coefficient is a statistical measure of the

To test for age differences in intelligence,at the beginning of the school year a researcher gave the same mathematics test to groups of children who were 8,10,12,and 14 years of age.This procedure best illustrates a

An observed difference between two sample groups is more likely to be statistically significant if

A lopsided distribution of scores in which the mean is much larger than both the mode and median is said to be

If a positive correlation between two sets of scores is displayed in a scatterplot,the points are clustered in a pattern that

The difference between the highest and lowest scores in a distribution is the

Seven members of a Girl Scout troop report the following individual earnings from their sale of cookies: $4,$1,$7,$6,$8,$2,and $7.In this distribution of individual earnings

As the size of a representative sample increases,the ________ of that sample is most likely to decrease.