Chapter 8 and Chapter 9

Question 1

se = σ / sqrt(n)

Answer 1

Equation for the standard error (standard deviation) of a distribution of sample means.

Question 2

Name the 2 assumptions that must be met for a distribution of sample proportions to be normally distributed.

Answer 2

n*p >= 5

n*(1-p) >= 5

Question 3

se = sqrt( [p*(1-p)] / n)

Answer 3

Equation for the standard error (standard deviation) of a distribution of sample proportions.

Question 4

The empirical rule states that _____ % of values of a normal random variable are within +/- 1 standard deviation of its mean.

Answer 4

68%

Question 5

The empirical rule states that _____ % of values of a normal random variable are within +/- 2 standard deviation of its mean.

Answer 5

95%

Question 6

The empirical rule states that _____ % of values of a normal random variable are within +/- 3 standard deviation of its mean.

Answer 6

99.7%

Question 7

The confidence associated with an interval estimate.

Answer 7

Confidence Level

Question 8

The confidence level expressed as a decimal value.

Answer 8

Confidence Coefficient

Question 9

An estimate of a population parameter that provides an interval believed to contain the value of the parameter.

Answer 9

Interval Estimate

Question 10

1 - α

Answer 10

Confidence Coefficient

Question 11

When σ is known, multiply the ____ and _____ to calculate the margin of error for an interval estimate for the population mean.

Answer 11

Z-Value at α/2

Standard Error of the Sample Mean Distribution

Question 12

When σ is unknown, multiply the ____ and _____ to calculate the margin of error for an interval estimate for the population mean.

Answer 12

T-Value at α/2

s / sqrt(n)

Question 13

σ

Answer 13

Population Standard Deviation

Question 14

s

Answer 14

Sample Standard Deviation

Question 15

x bar +/- margin of error

Answer 15

Interval Estimate for a Population Mean

Question 16

A family of probability distributions that can be used to develop an interval estimate of a population mean whenever the population standard deviation σ in unknown and is estimated by the sample standard deviation s.

Answer 16

T Distribution

Question 17

p bar +/- margin of error

Answer 17

Interval Estimate for a Population Proportion

Question 18

A parameter of the t distribution. When the t distribution is used in the computation of an interval estimate of a population mean, the appropriate t distribution has n-1, where n is the size of the sample.

Answer 18

Degrees of Freedom

Question 19

A tentative assumption about a population parameter.

Answer 19

Null Hypothesis

Question 20

The opposite of what is stated in the null hypothesis.

Answer 20

Alternative Hypothesis

Question 21

Used to determine whether a statement about the value of a population parameter should or should not be rejected.

Answer 21

Hypothesis Testing

Question 22

Hypothesis of no change.

Answer 22

Null Hypothesis

Question 23

The equality portion of the hypotheses always appears in the ____ hypothesis.

Answer 23

Null Hypothesis

Question 24

Name the 3 forms of hypothesis tests.

Answer 24

One-Tailed (Lower Tail / Decreasing)
One-Tailed (Upper Tail / Increasing)
Two-Tailed

Question 25

As degrees of freedom increases, the difference between the t distribution and the standard normal probability distribution _____ .

Answer 25

Decreases

Question 26

At 95% confidence, α equals ____ .

Answer 26

0.05

Question 27

True or False The t distribution is used when computing interval estimates when σ is known.

Answer 27

False

Question 28

True or False When σ is unknown, the sample standard deviation s is used to approximate the population standard deviation σ when computing interval estimates.

Answer 28

True

Question 29

H(o) : μ >= μ(o) | H(a) : μ < μ(o)

Answer 29

One-Tailed (Lower Tail) Hypothesis Test

Question 30

H(o) : μ <= μ(o) | H(a) : μ > μ(o)

Answer 30

One-Tailed (Upper Tail) Hypothesis Test

Question 31

H(o) : μ = μ(o) | H(a) : μ =/ μ(o)

Answer 31

Two-Tailed Hypothesis Test

Question 32

True or False When p is unknown, the sample proportion p bar is used to approximate the population proportion p when computing interval estimates.

Answer 32

True

Question 33

Multiply the ____ and _____ to calculate the margin of error for an interval estimate for the population proportion.

Answer 33

Z-Value at α/2 | Sqrt( [p bar * (1-p bar) ] / n)

Question 34

In a(n) lower / upper tail one-tailed hypothesis test, the alternative hypothesis suggests that the actual population mean μ is less than the hypothesized population mean μ(o).

Answer 34

Lower

Question 35

In a(n) lower / upper tail one-tailed hypothesis test, the alternative hypothesis suggests that the actual population mean μ is greater than the hypothesized population mean μ(o).

Answer 35

Upper

Question 36

The type of error that occurs when the null hypothesis is rejected when it is actually true.

Answer 36

Type I Error

Question 37

The type of error that occurs when the null hypothesis is not rejected when it is false.

Answer 37

Type II Error

Question 38

Another name for interval estimate.

Answer 38

Confidence Interval

Question 39

The +/- value added to and subtracted from a point estimate in order to develop an interval estimate of a population parameter.

Answer 39

Margin of Error

Question 40

A value that is compared with the test statistic to determine whether the null hypothesis should be rejected.

Answer 40

Critical Value

Question 41

The probability of making a Type I error when the null hypothesis is true as an equality.

Answer 41

Level of Significance

Question 42

A probability that provides a measure of the evidence against the null hypothesis given by the sample.

Answer 42

P-Value

Question 43

The probability of correctly rejecting the null hypothesis when it is false.

Answer 43

Power

Question 44

A graph of the probability of rejecting the null hypothesis for all possible values of the population parameter not satisfying the null hypothesis.

Answer 44

Power Curve

Question 45

A statistic whose value helps determine whether a null hypothesis should be rejected.

Answer 45

Test Statistic

Question 46

The Excel function that returns the normal distribution for the specified mean and standard deviation.

Answer 46

NORM.DIST

Question 47

The Excel function that returns the inverse of the normal cumulative distribution for the specified mean and standard deviation.

Answer 47

NORM.INV

Question 48

Name the Excel function used to create a confidence interval for a population mean when σ is known.

Answer 48

CONFIDENCE.NORM

Question 49

Name the Excel function used to create a confidence interval for a population mean when σ is unknown.

Answer 49

CONFIDENCE.T

Question 50

Name the Excel function used to compute the p-value for a one-tailed hypothesis test about a population mean when σ is unknown.

Answer 50

T.DIST.RT

Question 51

Name the Excel function used to compute the p-value for a two-tailed hypothesis test about a population mean when σ is unknown.

Answer 51

T.DIST.2T

Question 52

Name the Excel function used to compute the p-value for a one-tailed hypothesis test about a population mean when σ is known.

Answer 52

Z.TEST

Question 53

Name the Excel function used to create a confidence interval for a population proportion.

Answer 53

CONFIDENCE.NORM

Question 54

Name the test statistic used for a hypothesis test about a population mean when σ is known.

Answer 54

Z

Question 55

Name the test statistic used for a hypothesis test about a population mean when σ is unknown.

Answer 55

T

Question 56

Name the test statistic used for a hypothesis test about a population proportion.

Answer 56

Z

Question 57

Name the Excel function used to compute the p-value for a one-tailed (lower tail) hypothesis test about a population proportion.

Answer 57

NORM.S.DIST

Question 58

Name the Excel function used to compute the p-value for a one-tailed (upper tail) hypothesis test about a population proportion.

Answer 58

1 - NORM.S.DIST

Question 59

Name the Excel function used to compute the p-value for a two-tailed hypothesis test about a population proportion.

Answer 59

2 * NORM.S.DIST