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Exam 16: Statistical Reasoning in Everyday Life

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Question 71

Multiple Choice

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Students who score much higher on an exam than they usually do can reasonably anticipate ________ scores when they are retested.

A) very low
B) somewhat lower
C) equally high
D) even higher

E) C) and D)
F) B) and C)

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Question 72

Multiple Choice

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The standard deviation is the square root of the average squared deviation of scores from the

A) normal curve.
B) median.
C) mean.
D) range.

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

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Question 73

Multiple Choice

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On average,Caryl's school bus arrives on time,although sometimes it is a bit early or late.If the arrival times are distributed on a normal curve,which of the following statistics would enable Caryl to estimate the probability that her bus will arrive within 5 minutes of its scheduled arrival time on any given day?

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?

Random samples provide ________ estimates of population averages if the samples have small ________.

The average price for different brands of toothpaste could be visually displayed in a(n)

The most familiar measure of central tendency is the

Professor Schmidt has just finished collecting data on the relationship between weather changes and depression.What will she use to organize her data?

To decide whether observed differences between samples reflect actual differences between populations,you should determine the ________ of the observed differences.

Two students in an art class are at least 20 years older than the others.Which measure of variation of class members' ages is most affected by the ages of these two students?

Illusory correlation refers to

In a single day,45 babies were born in hospital X,65 babies in hospital Y,and 25 babies in hospital Z.At which hospital is there the greatest probability that more than 60 percent of the babies are of the same sex?

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 sample average can be used to estimate a population average with greater precision if the sample is