Exam 15: Statistical Reasoning in Everyday Life

Standard deviation is to mean as ________ is to ________.

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

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

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

A correlation coefficient is a statistical measure of the

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

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

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

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

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

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

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

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?

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

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?

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

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

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?

Measures of central tendency are most useful for

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