Attorneys
Suppose that you want to test whether the population proportion of attorneys who
make at least $400,000 per year is less than 0.24. A random sample of 200 attorneys
shows that there are 36 of them who make at least $400,000 a year.
What is the rejection region for a hypothesis test at a 10% significance level?
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z < -1.29
Which of the following is the null hypothesis if you are interested in knowing if there is
a difference between 2 population means?
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, H0: μ1 - μ2 = 0
The least squares method for determining the best fit minimizes:
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sum of squares for error
Of the values for a chi-squared test statistic listed below, which one is most likely to
lead to rejecting the null hypothesis in a goodness-of-fit test?
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45
A survey of 38 students indicated that their mean income was $28,378. Assume the
population standard deviation is $3,870. What is the upper bound of a 90%
confidence interval for the population mean income?
(Don't include a dollar sign in your answer - report the number only.)
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29,410.73 ± 5%
The width of a confidence interval estimate for a proportion will be:
, Give this one a try later!
narrower for 90% confidence level than for 95% confidence level.
To test the validity of a multiple regression model, we test the null hypothesis that the
regression coefficients are all zero by applying the:
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F-test
In regression analysis, if the R-squared is 1.0, then:
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the sum of squares for error must be 0.0
Preservatives A food processor wants to compare two preservatives for their effects
on retarding spoilage. Suppose 16 cuts of fresh meat are treated with preservative A
and 16 are treated with preservative B, and the number of hours until spoilage begins
is recorded for each of the 32 cuts of meat. The results are summarized in the table
below
Preservative A
Sample Mean 108.7 hours
Sample Standard Deviation 10.5 hours
Preservative B
Sample Mean 98.7 hours
Suppose that you want to test whether the population proportion of attorneys who
make at least $400,000 per year is less than 0.24. A random sample of 200 attorneys
shows that there are 36 of them who make at least $400,000 a year.
What is the rejection region for a hypothesis test at a 10% significance level?
Give this one a try later!
z < -1.29
Which of the following is the null hypothesis if you are interested in knowing if there is
a difference between 2 population means?
Give this one a try later!
, H0: μ1 - μ2 = 0
The least squares method for determining the best fit minimizes:
Give this one a try later!
sum of squares for error
Of the values for a chi-squared test statistic listed below, which one is most likely to
lead to rejecting the null hypothesis in a goodness-of-fit test?
Give this one a try later!
45
A survey of 38 students indicated that their mean income was $28,378. Assume the
population standard deviation is $3,870. What is the upper bound of a 90%
confidence interval for the population mean income?
(Don't include a dollar sign in your answer - report the number only.)
Give this one a try later!
29,410.73 ± 5%
The width of a confidence interval estimate for a proportion will be:
, Give this one a try later!
narrower for 90% confidence level than for 95% confidence level.
To test the validity of a multiple regression model, we test the null hypothesis that the
regression coefficients are all zero by applying the:
Give this one a try later!
F-test
In regression analysis, if the R-squared is 1.0, then:
Give this one a try later!
the sum of squares for error must be 0.0
Preservatives A food processor wants to compare two preservatives for their effects
on retarding spoilage. Suppose 16 cuts of fresh meat are treated with preservative A
and 16 are treated with preservative B, and the number of hours until spoilage begins
is recorded for each of the 32 cuts of meat. The results are summarized in the table
below
Preservative A
Sample Mean 108.7 hours
Sample Standard Deviation 10.5 hours
Preservative B
Sample Mean 98.7 hours
