PSY 210 Statistics CSN Exam 2 With All Correct & 100%
Verified Answers |Already Graded A+
A set of N = 4 scores has a mean of µ = 11. If 8 points are subtracted from one of the scores, what is
the new value for the population mean? ✔Correct Answer-9
A researcher is measuring the amount of time needed to solve a set of anagrams for a sample of n =
15 students. However, one of the participants fails to solve the problems so the researcher has an
undetermined score. What is the best measure of central tendency for these data? ✔Correct
Answer-mode
My electric bills for June, July, and August last summer were $75, $75, and $150, respectively. What
was the mean amount for the three bills? ✔Correct Answer-100
Which of the following actions will always change the value of the mean? ✔Correct Answer-all
What is the mean for the population of scores shown in the frequency distribution table?
Xf
52
41
33
22
12 ✔Correct Answer-2.90
In a sample of n = 6 scores, the smallest score is X = 3, the largest score is X = 10, and the mean is M =
6. If the largest score is changed from X = 10 to X = 22, then what is the value of the new mean?
✔Correct Answer-cannot be determined
If a population has a mean of μ = 24 with σ = 4 and N = 10, then ∑(X - μ)2 has a value of ✔Correct
Answer-160
μ = 40 and σ = 8. If each score is divided by 2, the new standard deviation will be ✔Correct Answer-
4
In general, what is the relationship between the standard deviation and variance? ✔Correct
Answer-SD is the square root of variance
For any set of data, the sum of the deviation scores will always be(Hint: this is different from
standard deviation) ✔Correct Answer-equal to zero
Degrees of freedom for sample variance are determined by ✔Correct Answer-n-1
In a sample of n = 3 scores, if two scores are each below the mean by 2 points, then the third score is
above the mean by 4 points. ✔Correct Answer-true
Changing the value of a score in a distribution will always change the value of the mean ✔Correct
Answer-true
Verified Answers |Already Graded A+
A set of N = 4 scores has a mean of µ = 11. If 8 points are subtracted from one of the scores, what is
the new value for the population mean? ✔Correct Answer-9
A researcher is measuring the amount of time needed to solve a set of anagrams for a sample of n =
15 students. However, one of the participants fails to solve the problems so the researcher has an
undetermined score. What is the best measure of central tendency for these data? ✔Correct
Answer-mode
My electric bills for June, July, and August last summer were $75, $75, and $150, respectively. What
was the mean amount for the three bills? ✔Correct Answer-100
Which of the following actions will always change the value of the mean? ✔Correct Answer-all
What is the mean for the population of scores shown in the frequency distribution table?
Xf
52
41
33
22
12 ✔Correct Answer-2.90
In a sample of n = 6 scores, the smallest score is X = 3, the largest score is X = 10, and the mean is M =
6. If the largest score is changed from X = 10 to X = 22, then what is the value of the new mean?
✔Correct Answer-cannot be determined
If a population has a mean of μ = 24 with σ = 4 and N = 10, then ∑(X - μ)2 has a value of ✔Correct
Answer-160
μ = 40 and σ = 8. If each score is divided by 2, the new standard deviation will be ✔Correct Answer-
4
In general, what is the relationship between the standard deviation and variance? ✔Correct
Answer-SD is the square root of variance
For any set of data, the sum of the deviation scores will always be(Hint: this is different from
standard deviation) ✔Correct Answer-equal to zero
Degrees of freedom for sample variance are determined by ✔Correct Answer-n-1
In a sample of n = 3 scores, if two scores are each below the mean by 2 points, then the third score is
above the mean by 4 points. ✔Correct Answer-true
Changing the value of a score in a distribution will always change the value of the mean ✔Correct
Answer-true
