MAS 291 EXAM 3 QUESTIONS AND 100%
CORRECT ANSWERS!!
Data that describe a characteristic about a population is known as a ________.
A. parameter
B. sample
C. statistic
D. survey
E. None of the other choices is true
A
A ________ represents all possible subjects of interest.
A. population
B. statistic
C. parameter
D. sample
E. None of the other choices is true
A
Retrospective study___________
A. uses current data.
B. uses future data.
C. uses historical data.
D. None of them
uses historical data
A method of gathering data when subjects are exposed to certain treatments and the data
of interest is recorded is known as_________________
,A. experiments.
B. observation.
C. retrospective
D. None of the other choices is correct
experiments.
The amount of television viewed by today's youth is of primary concern to Parents Against
Watching Television (PAWT). 250 parents of elementary school-aged children were asked
to estimate the number of hours per week that their child watches television. Identify the
type of data collected by PAWT.
A. qualitative
B. quantitative and continuous
C. quantitative and discrete
quantitative and continuous
The expected value of a negative binomial random variable with parameter p and r
(0<p<1;r = 0,1,2,3,4,5,....) is ________
A. (i) (1-p)/p^2
B. (ii) np
C. (iii) 1/p
D. (iv) r/p
r/p
A 99% confidence interval estimate can be interpreted to mean that______________
(i) we have 99% confidence that we have selected a sample whose interval does include the
population mean.
(ii) if all possible samples are taken and confidence interval estimates are developed, 99%
of them would include the true population mean somewhere within their interval
A. (i)
, B. (i) && (ii)
C. Both (i) and (ii)
D. Nether (i) nor (ii)
C
Suppose a 95% confidence interval for µ turns out to be (1000, 2100). Give a definition of
what it means to be 95% confident in an inference.
A. 95% of the observations in the entire population fall in the given interval.
B. In repeated sampling, 95% of the intervals constructed would contain the population
mean.
C. 95% of the observations in the sample fall in the given interval.
D. In repeated sampling, the population parameter would fall in the given interval 95% of
the time.
B
It is desired to estimate the average total compensation of CEOs in the Service industry.
Data were randomly collected from 18 CEOs and the 97% confidence interval was
calculated to be (2,181,260; 5,836,180). Based on the interval above, do you believe the
average total compensation of CEOs in the Service industry is more than 3,000,000?
A. I am 97% confident that the average compensation is 3,000,000.
B. Yes, and I am 97% confident of it.
C. Yes, and I am 78% confident of it.
D. I cannot conclude that the average exceeds 3,000,000 at the 97% confidence level.
D
A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC)
students attended the opening night midnight showing of the latest Harry Potter movie.
She surveys 84 of her students and finds that 11 of attended the midnight showing. The
Type I error is believing that the percent of EVC students who attended is____________
CORRECT ANSWERS!!
Data that describe a characteristic about a population is known as a ________.
A. parameter
B. sample
C. statistic
D. survey
E. None of the other choices is true
A
A ________ represents all possible subjects of interest.
A. population
B. statistic
C. parameter
D. sample
E. None of the other choices is true
A
Retrospective study___________
A. uses current data.
B. uses future data.
C. uses historical data.
D. None of them
uses historical data
A method of gathering data when subjects are exposed to certain treatments and the data
of interest is recorded is known as_________________
,A. experiments.
B. observation.
C. retrospective
D. None of the other choices is correct
experiments.
The amount of television viewed by today's youth is of primary concern to Parents Against
Watching Television (PAWT). 250 parents of elementary school-aged children were asked
to estimate the number of hours per week that their child watches television. Identify the
type of data collected by PAWT.
A. qualitative
B. quantitative and continuous
C. quantitative and discrete
quantitative and continuous
The expected value of a negative binomial random variable with parameter p and r
(0<p<1;r = 0,1,2,3,4,5,....) is ________
A. (i) (1-p)/p^2
B. (ii) np
C. (iii) 1/p
D. (iv) r/p
r/p
A 99% confidence interval estimate can be interpreted to mean that______________
(i) we have 99% confidence that we have selected a sample whose interval does include the
population mean.
(ii) if all possible samples are taken and confidence interval estimates are developed, 99%
of them would include the true population mean somewhere within their interval
A. (i)
, B. (i) && (ii)
C. Both (i) and (ii)
D. Nether (i) nor (ii)
C
Suppose a 95% confidence interval for µ turns out to be (1000, 2100). Give a definition of
what it means to be 95% confident in an inference.
A. 95% of the observations in the entire population fall in the given interval.
B. In repeated sampling, 95% of the intervals constructed would contain the population
mean.
C. 95% of the observations in the sample fall in the given interval.
D. In repeated sampling, the population parameter would fall in the given interval 95% of
the time.
B
It is desired to estimate the average total compensation of CEOs in the Service industry.
Data were randomly collected from 18 CEOs and the 97% confidence interval was
calculated to be (2,181,260; 5,836,180). Based on the interval above, do you believe the
average total compensation of CEOs in the Service industry is more than 3,000,000?
A. I am 97% confident that the average compensation is 3,000,000.
B. Yes, and I am 97% confident of it.
C. Yes, and I am 78% confident of it.
D. I cannot conclude that the average exceeds 3,000,000 at the 97% confidence level.
D
A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC)
students attended the opening night midnight showing of the latest Harry Potter movie.
She surveys 84 of her students and finds that 11 of attended the midnight showing. The
Type I error is believing that the percent of EVC students who attended is____________
