Question 647388:
1. A psychologist studied self-esteem scores and found the sample data set to be normally distributed with a mean of 50 and a standard deviation of 5.
What is the median of this distribution?
Answer
a 45
b 55
c 50
d 5
e Cannot be determined from the information given
2.In a negatively skewed distribution, Alisha scored the mean, Ken scored the median, and Catherine scored the mode. Who had the highest score?
Answer
a Alisha
b Ken
c Catherine
d All three scored approximately the same
3.In a normal distribution, Alisha scored the mean, Ken scored the median, and Catherine scored the mode. Who had the lowest score?
Answer
a Alisha
b Ken
c Catherine
d All three scored approximately the same
4.The standard normal distribution has a mean of ___ and a variance of ____
Answer
a 0; 0
b 1; 1
c 1; 0
d 0; 1
c 100; 15
5.A student scored 76 points on a quiz, and the student’s standard score was +2. The standard deviation of quiz scores was 10. What was the mean of the quiz scores?
Answer
a 56
b 64
c 88
d 96
e more than one answer is correct.
6.The standard deviation for the sample consisting of 6, 8, and 10 is
Answer
a 12.00
b -0.67
c 1.00
d 1.63
e 2.00
7.A medical association randomly selected 10 trauma surgeons and 10 medical researchers and asked them how flexible their schedule is on a 1 (not at all flexible) to 9 (very flexible) scale. The data are summarized below:
Trauma surgeons
mean 2
variance 1
Medical researchers
mean 7
variance 3
Select the statement that accurately reflects these results:
Answer
a. All medical professionals have similar levels of flexibility in their schedules.
b. Trauma surgeons have more flexibility than medical researchers.
c. Medical researchers agree more with each other about their level of flexibility than trauma surgeons.
d. Trauma surgeons agree more with each other about their level of flexibility than medical researchers.
c. none of the above
8. A sample of data has a standard deviation of 10. If you were to multiply all of the scores in the data set by factor of nine (9), what would the new standard deviation be?
Answer
a 5
b 10
c 30
d 90
e 10
9. Select the statement that is false.
Answer
a. Given a raw score, its z-score is the number of standard deviations above or below the mean.
b. The variance for a set of data can be a negative value.
c. A normal curve with mean 0 and standard deviation 10 has a greater spread of scores than a normal curve with mean 0 and standard deviation 1.
d. The standard deviation for a set of data
10. Along with the mean, which of the following completely characterizes a standard normal distribution?
Answer
a Mode
b Skew
c Variance
d Symmetry
e Median
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website!
Hi,will quickly help with several...
For a perfect normal distribution, the mean, median and mode are all equal.
1. C and 3. D
4. D (m = 0 and SD = 1, variance = SD^2
5. 2 = 76-m/10, m = 56
6. m=8, variance = 8/2 = 4, SD = sqrt(4) = 2
10. variance
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