statistics review questions (13 questions; need the answers)

jobless jack

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Dec 10, 2017
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Hi could someone please show me the correct answears with these review questions for our class ?

1. The z-value that is used to construct a 95% confidence interval is
A 1.28 B 1.96
C 2.58 D 1.64



2. For a symmetric distribution
A. the mean is larger than the median.
B. the mean, median and the mode are equal.
C. the mean is smaller than the median.
D. the mode is the largest value.


3. Which graph can describe the frequency distribution of categorical variable?
A bar chart B pie chart
C histogram D scatter graph



4. In the chi-square test of 2×2 table, When should we choose the Yate’s correction formula?
A. n≥40 and 1≤O<5 B. 1≤O<5
C. 1≤E<5 D. n≥40 and 1≤E<5



5. In order to investigate the status of the patients with hypertension. The results show that there are 50 patients and 50 healthy people in 100 residents. Such kind of data is
A. numerical data B. multichotomus data
C. binary data D. ordinal data.



6. In the comparison of two-independent samples mean, df is
A n1-1 B n2-1
C n1+ n2-1 D n1+ n2-2



7 The standard normal distribution
A is a special case of the normal distribution.
B. has a mean of 0 and a standard deviation of 1.
C. measures the distance from the mean in units of the standard deviation.
D all of the above.


8 In the paired t-test, we assume in the null hypothesis that the distribution of the differences between the paired observation has a mean
A. equal to 1. B. equal to n - 1.
C.equal to 0. D. none of the above
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9 In a random sampling (n = 400), we got a sample with the mean of 60 and the standard deviation of 10, then the standard error of the sample mean will be
A 0.5 B 30 C 0.025 D 0.15



10 The standard error of the mean
A is less than the standard deviation
B decreases as the sample size increases while standard deviation in definite.
C measures the variability of the mean from sample to sample
D all of the above

11 If we wish to determine whether there is evidence that the proportion of successes is higher in group 1 than in group 2 and we have obtained independent samples from the two groups, the appropriate test to use is
A t test B chi-square test
C F test D rank sum test


12. When sample size increases,
A. standard error increases B. standard deviation increases
C. standard deviation decreases D. standard error decreases


13. Wilcoxon rank sum test was used to analyze the difference of the following two groups, the observations in the experimental group are 0, 0, 7, 14, 32, 40, while the observations in the control group are 0, 1, 2, 4, 4, 8. The “0”in the above groups should be ranked as

A. 2, 3, 1 B. 1.5, 1.5, 3
C. 2, 2, 2 D. 2.5, 2.5, 1
 
1. The z-value that is used to construct a 95% confidence interval is
A 1.28 B 1.96
C 2.58 D 1.64

2. For a symmetric distribution
A. the mean is larger than the median.
B. the mean, median and the mode are equal.
C. the mean is smaller than the median.
D. the mode is the largest value.

3. Which graph can describe the frequency distribution of categorical variable?
A bar chart B pie chart
C histogram D scatter graph

4. In the chi-square test of 2×2 table, When should we choose the Yate’s correction formula?
A. n≥40 and 1≤O<5 B. 1≤O<5
C. 1≤E<5 D. n≥40 and 1≤E<5
What are your thoughts?

Please share your work with us ...even if you know it is wrong.
If you are stuck at the beginning tell us and we'll start with the definitions.
You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:
http://www.freemathhelp.com/forum/announcement.php?f=33
 
5. In order to investigate the status of the patients with hypertension. The results show that there are 50 patients and 50 healthy people in 100 residents. Such kind of data is
A. numerical data B. multichotomus data
C. binary data D. ordinal data.



6. In the comparison of two-independent samples mean, df is
A n1-1 B n2-1
C n1+ n2-1 D n1+ n2-2



7 The standard normal distribution
A is a special case of the normal distribution.
B. has a mean of 0 and a standard deviation of 1.
C. measures the distance from the mean in units of the standard deviation.
D all of the above.


8 In the paired t-test, we assume in the null hypothesis that the distribution of the differences between the paired observation has a mean
A. equal to 1. B. equal to n - 1.
C.equal to 0. D. none of the above


Please share your work with us ...even if you know it is wrong.

If you are stuck at the beginning tell us and we'll start with the definitions.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/announcement.php?f=33
 
9 In a random sampling (n = 400), we got a sample with the mean of 60 and the standard deviation of 10, then the standard error of the sample mean will be
A 0.5 B 30 C 0.025 D 0.15



10 The standard error of the mean
A is less than the standard deviation
B decreases as the sample size increases while standard deviation in definite.
C measures the variability of the mean from sample to sample
D all of the above

11 If we wish to determine whether there is evidence that the proportion of successes is higher in group 1 than in group 2 and we have obtained independent samples from the two groups, the appropriate test to use is
A t test B chi-square test
C F test D rank sum test
What are your thoughts?

Please share your work with us ...even if you know it is wrong.

If you are stuck at the beginning tell us and we'll start with the definitions.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/announcement.php?f=33
 
12. When sample size increases,
A. standard error increases B. standard deviation increases
C. standard deviation decreases D. standard error decreases


13. Wilcoxon rank sum test was used to analyze the difference of the following two groups, the observations in the experimental group are 0, 0, 7, 14, 32, 40, while the observations in the control group are 0, 1, 2, 4, 4, 8. The “0”in the above groups should be ranked as

A. 2, 3, 1 B. 1.5, 1.5, 3
C. 2, 2, 2 D. 2.5, 2.5, 1
What are your thoughts?

Please share your work with us ...even if you know it is wrong.

If you are stuck at the beginning tell us and we'll start with the definitions.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/announcement.php?f=33
 
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