RES 7415 RES7415 WEEK 1 QUIZ WITH ANSWERS (ASHFORD)
RES 7415 Week 1 Quiz Answers (University of Rockies)
Which of the following are measures of central tendency? Select all that apply
mean
median
mode
variance
standard deviation
linear transformation
0.1 / 0.1 pts
In a normal distribution, the median is ____it’s mean and mode
Smaller than
Bigger than
Approximately equal to
Unrelated to
0.1 / 0.1 pts
If a distribution is left-skewed, its mean is usually___ its median
bigger than
smaller than
equal to
we can not know
0.1 / 0.1 pts
___is the probability of a Type II error; and ___ is the probability of correctly rejecting a false null hypothesis
1-β; β
β; 1-β
α; β
β; α
Question 5
0 / 0.1 pts
Which of the following could reduce the rate of Type I error?
Making the significant level from 0.01 to 0.05
Making the significant level from 0.05 to 0.01
Increase the β level
Increase the power
Question 6
Which of the following descriptions of confidence interval is correct? (Select all that apply)
If a 99% confidence interval contains 0, then the 95% confidence interval contains 0
If a 95% confidence interval contains 0, then the 99% confidence interval contains 0
If a 99% confidence interval contains 1, then the 95% confidence interval contains 1
If a 95% confidence interval contains 1, then the 99% confidence interval contains 1
0.1 / 0.1 pts
A researcher believed that there was a difference in the amount of time boys and girls at 7th grade studied by using a two-tailed t test. Which of the following is the null hypothesis?
Mean of hours that boys studied per day was equal to mean of hours that girls studied per day
Mean of hours that boys studied per day was greater than mean of hours that girls studied per day
Mean of hours that boys studied per day was smaller than mean of hours that girls studied per day
Mean of hours that boys studied per day was smaller than or equal to mean of hours that girls studied per day
Not enough information
10 students participate in Statistics quiz 2, their grades are: 98, 85,89,73,76,85,87,92,85,56 The professor wants to know the mean of the grades
73.5
87.8
83.7
82.6
86.2
0.1 / 0.1 pts
A normal distribution with a mean of 15 and standard deviation of 5. 95% of its area is within__
One standard deviation of the mean
Two standard deviations of the mean
Three standard deviations of the mean
It depends on the value of the mode
0.1 / 0.1 pts
A student hypothesized that girls in his class had the same blood pressure levels as boys. The probability value for his null hypothesis was 0.15. So he concluded that the blood pressures of the girls were higher than boys’. Which kind of mistake did he make?
Type I error
Type II error
Type I and Type II error
He did not make any mistake
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