BESC 3010 Exam 2 (1-8) Questions With
Complete Solutions
-1 Correct Answers If a test has a population mean of 140 and
standard deviation of 12, then what is the z-score for the sample
of n = 9 scores with a mean of 136?
.05 Correct Answers When choosing a level of alpha for a
hypothesis test, unless you have a compelling reason to do
otherwise, you should use...
"Estimation" refers to a class of... Correct Answers inferential
statistics.
0 Correct Answers If a positively skewed distribution of 132
scores with a mean of 49 and a standard deviation of 14 is
standardized then the new distribution's mean will be ______.
1 Correct Answers What is the standard error of a distribution
if
19.72, 26.28 Correct Answers Imagine a sample with n = 225
and a mean of 23 that comes from a population with a standard
deviation of 30. Based on these data, what would be the 90%
confidence interval for the population mean? (Use z-scores of
±1.64 for the 90% confidence level.)
2 Correct Answers If a distribution has a mean of 20 and a
standard deviation of 3, then a raw score of 26 would have a z-
score of ______.
,2 Correct Answers If a distribution has a mean of 200 and a
standard deviation of 40, then what is the standard error for a
sample of 400 scores?
2 Correct Answers If a distribution has a mean of 70 and a
standard deviation of 4, then what is the z-score for a sample of
64 scores with a mean of 71?
2 Correct Answers If a population has a mean of 40 and a
standard deviation of 9, what would the z-score be for a sample
of 9 people with a mean of 46?
2.5 Correct Answers What is the population variance for this
data set?
3 Correct Answers If a population has a mean of 60 and a
standard deviation of 8, what is the z-score for a sample of 144
people with an average of 62?
3 Correct Answers If the population mean for a distribution is
150 and the standard deviation is 10, then what is the z-score for
a sample of 100 people with an average score of 153?
3.32 Correct Answers What is the sample standard deviation
for this data set?
46.12, 57.88 Correct Answers Imagine a sample with n = 16
and a mean of 52 that comes from a population with a standard
deviation of 12. Based on these data, what would be the 95%
confidence interval for the population mean? (Use z-scores of
,55 Correct Answers What is the point estimate for the
population mean if the sample mean is 55, the population
standard deviation is 15, and the sample size is 25?
6.5 Correct Answers What is the IQR for this data set?8, 1, 1,
3, 1, 8, 4, 7
62.13, 81.87 Correct Answers Imagine a sample with n = 64
and a mean of 72 that comes from a population with a standard
deviation of 24. Based on these data, what would be the 99.9%
confidence interval for the population mean? (Use z-scores of
±3.29 for the 99.9% confidence level.)
92.44, 97.56 Correct Answers Imagine a sample with n = 49
and a mean of 95 that comes from a population with a standard
deviation of 14. Based on these data, what would be the 80%
confidence interval for the population mean? (Use z-scores of
±1.28 for the 80% confidence level.)
A bivariate analysis typically focuses on... Correct Answers
The association of two variables
a confidence interval Correct Answers Which is more accurate:
a point estimate or a confidence interval?
A confidence interval specifies a range of values for a parameter
estimate, whereas a(n) _____ specifies just a single value for
that parameter. Correct Answers point estimate
, A distribution such as income that has most of the people at the
bottom or middle but a few people with extremely high scores is
referred to as... Correct Answers Positively skewed
A distribution with two distinct peaks can be described as
Correct Answers Bimodal
A frequency bar graph would be most appropriate for which
measurement scales? Correct Answers Nominal or ordinal
A histogram is appropriate when the data are... Correct Answers
Quantitative
A narrow distribution that is sharply pointed in the middle and
that has many outliers is called... Correct Answers Leptokurtic
A normal distribution has a value of skew ness that is ... Correct
Answers Near zero
a point estimate Correct Answers Which is more precise: a
point estimate or a confidence interval?
A point estimate for the population mean is based on... Correct
Answers Sample Mean
A point estimate for the population mean is based on... Correct
Answers the sample mean.
A point estimate gives a single value but a confidence interval
gives a range of values Correct Answers What is one important
difference between a point estimate and a confidence interval?
Complete Solutions
-1 Correct Answers If a test has a population mean of 140 and
standard deviation of 12, then what is the z-score for the sample
of n = 9 scores with a mean of 136?
.05 Correct Answers When choosing a level of alpha for a
hypothesis test, unless you have a compelling reason to do
otherwise, you should use...
"Estimation" refers to a class of... Correct Answers inferential
statistics.
0 Correct Answers If a positively skewed distribution of 132
scores with a mean of 49 and a standard deviation of 14 is
standardized then the new distribution's mean will be ______.
1 Correct Answers What is the standard error of a distribution
if
19.72, 26.28 Correct Answers Imagine a sample with n = 225
and a mean of 23 that comes from a population with a standard
deviation of 30. Based on these data, what would be the 90%
confidence interval for the population mean? (Use z-scores of
±1.64 for the 90% confidence level.)
2 Correct Answers If a distribution has a mean of 20 and a
standard deviation of 3, then a raw score of 26 would have a z-
score of ______.
,2 Correct Answers If a distribution has a mean of 200 and a
standard deviation of 40, then what is the standard error for a
sample of 400 scores?
2 Correct Answers If a distribution has a mean of 70 and a
standard deviation of 4, then what is the z-score for a sample of
64 scores with a mean of 71?
2 Correct Answers If a population has a mean of 40 and a
standard deviation of 9, what would the z-score be for a sample
of 9 people with a mean of 46?
2.5 Correct Answers What is the population variance for this
data set?
3 Correct Answers If a population has a mean of 60 and a
standard deviation of 8, what is the z-score for a sample of 144
people with an average of 62?
3 Correct Answers If the population mean for a distribution is
150 and the standard deviation is 10, then what is the z-score for
a sample of 100 people with an average score of 153?
3.32 Correct Answers What is the sample standard deviation
for this data set?
46.12, 57.88 Correct Answers Imagine a sample with n = 16
and a mean of 52 that comes from a population with a standard
deviation of 12. Based on these data, what would be the 95%
confidence interval for the population mean? (Use z-scores of
,55 Correct Answers What is the point estimate for the
population mean if the sample mean is 55, the population
standard deviation is 15, and the sample size is 25?
6.5 Correct Answers What is the IQR for this data set?8, 1, 1,
3, 1, 8, 4, 7
62.13, 81.87 Correct Answers Imagine a sample with n = 64
and a mean of 72 that comes from a population with a standard
deviation of 24. Based on these data, what would be the 99.9%
confidence interval for the population mean? (Use z-scores of
±3.29 for the 99.9% confidence level.)
92.44, 97.56 Correct Answers Imagine a sample with n = 49
and a mean of 95 that comes from a population with a standard
deviation of 14. Based on these data, what would be the 80%
confidence interval for the population mean? (Use z-scores of
±1.28 for the 80% confidence level.)
A bivariate analysis typically focuses on... Correct Answers
The association of two variables
a confidence interval Correct Answers Which is more accurate:
a point estimate or a confidence interval?
A confidence interval specifies a range of values for a parameter
estimate, whereas a(n) _____ specifies just a single value for
that parameter. Correct Answers point estimate
, A distribution such as income that has most of the people at the
bottom or middle but a few people with extremely high scores is
referred to as... Correct Answers Positively skewed
A distribution with two distinct peaks can be described as
Correct Answers Bimodal
A frequency bar graph would be most appropriate for which
measurement scales? Correct Answers Nominal or ordinal
A histogram is appropriate when the data are... Correct Answers
Quantitative
A narrow distribution that is sharply pointed in the middle and
that has many outliers is called... Correct Answers Leptokurtic
A normal distribution has a value of skew ness that is ... Correct
Answers Near zero
a point estimate Correct Answers Which is more precise: a
point estimate or a confidence interval?
A point estimate for the population mean is based on... Correct
Answers Sample Mean
A point estimate for the population mean is based on... Correct
Answers the sample mean.
A point estimate gives a single value but a confidence interval
gives a range of values Correct Answers What is one important
difference between a point estimate and a confidence interval?
