QUESTION 27For a normal distribution with a mean of 10 and a standard deviation of 5, what is the probability of scoring...
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QUESTION 27
For a normal distribution with a mean of 10 and a standard deviation of 5, what is the probability of scoring below a 11.25? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.
1 points
QUESTION 28
For a normal distribution with a mean of 10 and a standard deviation of 5, what is the probability of scoring below a 12.25? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.
1 points
QUESTION 29
For a normal distribution with a mean of 10 and a standard deviation of 5, what is the probability of scoring below a 5? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.
1 points
QUESTION 30
For a normal distribution with a mean of 20 and a standard deviation of 10 what the probablity of scoring above a 17? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.
1 points
QUESTION 31
For a normal distribution with a mean of 20 and a standard deviation of 10 what the probablity of scoring above a 20? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.
1 points
QUESTION 32
For a normal distribution with a mean of 0 and a standard deviation of 1 what the probability of scoring between a -1.75 and 1.25? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.
1 points
QUESTION 33
For a normal distribution with a mean of 0 and a standard deviation of 1 what the probability of scoring between a 1.25 and 2.75? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.
1 points
QUESTION 34
What proportion (in decimal form) of people have a favorite color blue? Round to the second decimal place. Use the following frequency table:
color | frequency |
blue | 31 |
green | 22 |
red | 69 |
1 points
QUESTION 35
What is the sample correlation for the following data? Round to the second decimal place.
x | y |
34 | 60 |
5 | 1 |
88 | 4 |
1 points
QUESTION 36
What is the sample correlation for the following data? Round to the second decimal place.
x | y |
81 | 87 |
17 | 51 |
54 | 23 |
1 points
QUESTION 37
A distribution has a mean of 9 and standard deviation of 2. What is the raw score for a z score of -1.02? Round to the second decimal place.
UESTION 1
A distribution has a mean of 5 and a standard deviation of 7 what is the z score of a raw score of 5. Round to the second decimal place.
1 points
QUESTION 2
A researcher is interested in the effects of a drug therapy on depression in all adults with depression. The researcher gives the drug to 30 adults. She finds an average depression score of 3. The number 3 is aâ¦
sample | |
population | |
parameter | |
statistic |
1 points
QUESTION 3
What percentage liked the movie? Round to the second decimal place.
Statistifaction | Frequency |
Liked | 78 |
Disliked | 10 |
1 points
QUESTION 4
Find the sample standard deviation for the following values. Round to the second decimal place.
48, 31, 71
1 points
QUESTION 5
What is the sum of squares for the following data? Round to the second decimal place, if needed.
54, 15, 37, 72
1 points
QUESTION 6
If the sample size is 99 what would be the degrees of freedom be for a one sample t-test?
1 points
QUESTION 7
A professor knows his tests generally have an average of 75 with a standard deviation of 10. The professor is now teaching a condensed course in the summer. The summer course is less weeks than his normal classes. The professor is afraid that the summer course is too condensed and negatively affects tests scores. The professor administers his test to his current 64 students in his summer course. The mean of the 64 students is 71. Is there statistically significant evidence to conclude students in his summer class performed worse than students in his regular semester courses?
What is the test statistic?
1 points
QUESTION 8
ACT scores are normally distributed and have a mean of 20.8 and a standard deviation of 4.8. A researcher wants to know students at her college compare to the national average. The researcher randomly samples 36 students at her school. The sample average for the sample was 18. Do the students significantly differ from the general population?
What should the null hypothesis be?
1 points
QUESTION 9
A professor knows his tests generally have an average of 75 with a standard deviation of 10. The professor is now teaching a condensed course in the summer. The summer course is less weeks than his normal classes. The professor is afraid that the summer course is too condensed and negatively affects tests scores. The professor administers his test to his current 64 students in his summer course. The mean of the 64 students is 71. Is there statistically significant evidence to conclude students in his summer class performed worse than students in his regular semester courses?
What should the null hypothesis be?
1 points
QUESTION 10
A normal population has a mean of 25. After receiving a treatment, a sample of scores yields the following data: 20 28 20 20. Research question: Is there evidence for that the scores differ after receiving the treatment? What is the test statistic? Hint: Find the sample mean and sample standard deviation first.
1.5 | |
3.25 | |
-1.5 | |
-3.25 |
1 points
QUESTION 11
SAT scores are known to have a mean of 1500 and a standard deviation of 250. A researcher is testing out a new SAT prep course. The researcher selects 49 high school students with a variety ofGPAs. The students are given the prep course and then they take the SAT. The average SAT score for the students is 1600 Is there statistical evidence to conclude the prep course was effective? Use an alpha of .10.
What should the null hypothesis be?
1 points
QUESTION 12
The formula (X â ?)/? is used to calculate a:
raw score | |
mean distribution | |
standard deviation | |
z score |
1 points
QUESTION 13
A z score tells you how many _____ you are from the _____.
mean deviations; median | |
standard deviations; mean | |
standard deviations; median | |
mean deviations; mean |
1 points
QUESTION 14
A z score of â3.0 is _____ a z score of â2.0
lower than | |
higher than | |
the same as | |
more standard than |
1 points
QUESTION 15
According to Cohen, a correlation of .6 is?
weak | |
moderate | |
strong |
1 points
QUESTION 16
If the sample size is 51 and the t-statistic is -2, what is the p-value for a less than research hypothesis?
.034578 | |
.012332 | |
.013874 | |
.025474 |
1 points
QUESTION 17
For a perfect correlation to occur, what would need to be the next grade value. You may need to create a scatterplot.
Hours Studied | Grade |
2 | 60 |
6 | 70 |
6 | 70 |
8 | 75 |
10 | 80 |
10 | 80 |
12 | ? |
1 points
QUESTION 18
Measures of central tendency and variability are calculated to describe the nature of charitable giving each year. These figures are computed for the âaverageâ American citizen. Which of these is a possible value for the variance in dollars given?
A. | $47.26 squared dollars | |
B. | $38.45 to $47.26 | |
C. | â$47.26 | |
D. | $47.26 |
1 points
QUESTION 19
As the sample size increases for a sampling distribution (n for each sample) the standard error decreases.
True
False
1 points
QUESTION 20
The population of some scores are normally distributed, and a sample of 10 is taken, would the sampling distribution be normally distributed (according to the Central Limit Theorem)?
yes | |
no |