Question 1. You might choose to survey an entire population if the population is

Question

Question 1.

You might choose to survey an entire population if the population is

Question options:
  
a) small.

  
b) accessible.

  
c) real.

  
d) important.

Question 2       0 / 1 point
Strictly speaking, any generalization in inferential statistics should be limited to the

Question options:
  
a) sample.

  
b) population.

  
c) real population that has been sampled.

  
d) hypothetical population that has been sampled.

Question 8       0 / 1 point
If scores on two successive statistics exams are dependent, the probability of your getting an A on both the first exam (A1) and the second exam (A2) equals

Question options:
  
a) the probability of A1 multiplied by the conditional probability of A2.

  
b) the probability of A1 multiplied by the conditional probability of A2, given A1.

  
c) the probability of A2 multiplied by the conditional probability of A2, given A1.

  
d) the conditional probability of A1 multiplied by the conditional probability of A2.

Question 9       0 / 1 point
. If the probability equals .01 that any randomly selected person from the general population has an IQ of 145 or above, what's the probability that three randomly selected people all will have IQs of 145 or above?

Question options:
  
a) .01 + .01

  
b) .01 + .01 + .01

  
c) (.01)(.01)

  
d) (.01)(.01)(.01)

Question 10       0 / 1 point
Given that the probability equals .025 that a randomly selected z score (from the standard normal table) deviates above 1.96, the probability that a z score deviates either above 1.96 or below 1.96 equals

Question options:
  
a) .025   

  
b) .025 + .025

  
c) (.025)(.025)

  
d) .25

Question 11       0 / 1 point
The sampling distribution of the mean describes

Question options:
  
a) the entire population.

  
b) the entire sample.

  
c) all sample means that could occur just by chance.

  
d) the sampled distribution.

Question 15       0 / 1 point
A random sample of 100 college students is taken from the student body of a large university. Each student estimates the number of hours spent studying each week. Therefore, the sampling distribution of the mean is

Question options:
  
a) approximately normal in shape.

  
b) very compact.

  
c) equal to the population.

  
d) centered about the sample mean.

Question 16       0 / 1 point
Given that the population standard deviation equals 40 and that the sample consists of 25 observations, the standard error of the mean equals

Question options:
  
a) 0.80

  
b) 5

  
c) 8

  
d) 40

Question 17       0 / 1 point
A random sample of 100 college students is taken from the student body of a large university Assume that, in fact, a population standard deviation of 15 hours describes the weekly study estimates for the entire student body. Therefore, the sampling distribution of the mean has a standard error that is

Question options:
  
a) very compact.

  
b) equal to 1.50 hours.   

  
c) less than 15 hours.

  
d) known.

Question 18       0 / 1 point
A random sample of 100 college students is taken from the student body of a large university Assume that, in fact, a population mean of 20 hours and a standard deviation of 15 hours describe the weekly study estimates for the entire student body. Therefore, the sampling distribution of the mean has a mean that

Question options:
  
a) approximates 20 hours.

  
b) equals 20 hours.

  
c) lies within a couple of hours of 20.

  
d) equals the one observed sample mean.

Question 19       0 / 1 point
A random sample of 100 college students is taken from the student body of a large university Assume that, in fact, a population mean of 20 hours and a population standard deviation of 15 hours describe the weekly study estimates for the entire student body. About 68 percent of the sample means in this sampling distribution should be between

Question options:
  
a) 18.50 and 21.50 hours.

  
b) 16.50 and 20.50 hours.

  
c) 19 and 21 hours.

  
d) 17 and 23 hours.

Explanation / Answer

1) b) accessible

2) c) real population that has been sampled

8) b) P(A1)*P(A2|A1)

9) d) 0.1*0.1*0.1

10) b) 0.025+0.025

11) c) all sample means that could occur just by chance

15) d) centered about the sample mean

16) c) 8

17) b) 1.5hr

18) b) 20

19) a) 18.50 and 21.50 hrs

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