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55 Cards in this Set
- Front
- Back
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An appropriate null hypothesis? |
the population proportion is not less than 0.65 |
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An appropriate alternative hypothesis? |
the mean of a population is greater than 55
the population proportion is less than 0.65 |
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A type II error is committed when? |
you don't reject a null hypothesis that is false |
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A type I error is committed when? |
you reject a null hypothesis that is true |
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The power of a test is measured by its capability of? |
rejecting a null hypothesis that is false |
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If an economist wished to determine whether there is evidence that mean family income in a community exceeds $50,000? |
a one tail test should be utilized |
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If an economist wished to determine whether there is evidence that mean family income in a community is equal to $50,000? |
a two tail test should be utilized |
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If the p-value is less than x in a two-tail test? |
the null hypothesis should be rejected |
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If the type 1 error for a given test is to be decreased, then for a fixed sample size n? |
the type II error will increase |
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For a given sample size n, if the level of significance is decreased, the power of the test? |
will decrease |
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For a given level of significance, if the sample size n is increased, the probability of a type II error? |
will decrease |
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the power of a statistical test is? |
the probability of rejecting H0 when it's false |
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The symbol for the power of a statistical test is ? |
1- B |
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level of significance of a statistical test is? |
α |
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The symbol for the confidence coefficient of a statistical test is? |
1- α |
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the symbol for the probability of committing a type II error of a statistical test is? |
β |
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test statistic |
a numerical quantity computed from the data of a sample and is used in reaching a decision on whether or not to reject the null hypothesis |
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A major blue ray rental store? |
reject h0 in favor of h1 |
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The marketing manager for an automobile manufacturer. Which test do you use? |
z test of a population proportion |
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Business vs Ag majors
What is the type I error? what is the type II error? |
Type I error is saying that the person is an ag major when in fact the person is a business major
type II error is saying that the person is a business major when in fact the person is an agriculture major |
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power of the test is equal to what? |
β (type II error, alt hypothesis) |
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For a major home improvement store, what is the parameter the company officials are interested in? |
the proportion of viewers who like ads a lot a |
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For e retailers, the parameter the company officials are interest in is? |
the proportion of browsers who buy something in their visit to the companys website |
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For the e retailer, the null hypothesis will be rejected if the test statistic is? |
greater than 1.645 |
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The T test for the difference between the means of 2 independent populations assumes that the respective? |
population are approximatly normal |
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In testing for differences between the means of two independent populations, the null hypothesis is? |
H0 : μ1 - μ2 = 0.
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If you know that the level of significance of a test is 5%, you can tell that the probability of committing a type II error is? |
unknown |
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If you know that the probability of committing a type II error is 5%, you can tell that the power of a test it? |
95% |
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the symbol for the probability of committing a type I error of a statistical test is? |
α |
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T stat of how many tissues? |
Reject H0 is t < -1.6604 |
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Which of the following is not true about the level of significance in a hypothesis test? |
the significance level is another name for type II error |
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The owner of a bar, what decision should she make? |
dont reject h0 |
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For the owner of a nightclub, what is the p value associated with the test statistic? |
0.0780 |
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an entrepreneur is considering the purchase of a coin operated laundry. Which test would you use? |
Z test of population mean |
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A manager of a credit department for an oil company. Which test would you use? |
t test of population mean |
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a survey claiming that 9 out of 10 doctors recommend aspirin. what is that value of the t stat? |
-2.33 |
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A blue ray rental chain is considering opening a new store. What is the value of the t stat? |
2.80 |
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A blue ray rental chain is considering opening a new store. What is the p value? |
.0026 |
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The marketing major of an automobile manufactuer is interested in determining the proportion. Which test would he use? |
z test of population proportion |
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level of significance is ? |
1-α |
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level of significance for the business/ag test is? |
0.13 |
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actual confidence coefficient is ? |
α |
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actual confidence coefficient for the bus/ag test is? |
.87 |
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bus/ag test, what is the value of α? |
.13 |
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for bus/ag test what is the value of β? |
.16 |
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for bus/ag test what is the power of the test? |
.84 |
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For microwave, what is the population of interest? |
the power consumption in all such microwaves |
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for microwave, what is the parameter of interest? |
the mean power consumption of all such microwaves |
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the appropriate hypothesis for the microwave? |
h0: u is less that greater too |
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a larger α results in a larger? |
rejection region |
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the t test for the difference between the means of 2 independent populations assumes that the respective? |
populations are approximently normal |
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In testing for difference between the means of two independent populations, the null hypothesis is? |
H0: u1-u2 = 0 |
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In a one way ANOVA, if the computed F statistic is greater than the critical F value you may? |
reject the H0 since there is evidence that not all the means are different |
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A completely randomized design? |
has only one factor with several treatment groups |
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In a one way ANOVA |
there is no interaction term |
