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Worksheetsparametric & non-parametric
Total questions: 20
Worksheet time: 15mins
Name
Class
Date
1.
A p value of 0.05 means
a)
There is only 5% chance that the results are incorrect
b)
There is probability of 5 in 100 that this result would occur if the null hypotheses were true
c)
There is only 5% chance of getting this result
d)
All of the above are true
2.
While testing for single population mean when the sample size n is less than 30 and population standard deviation is unknown
a)
z test is used.
b)
t test with n-2 degrees of freedom is used.
c)
t test with n-1 degrees of freedom is used.
d)
None of the above statement is true.
3.
Testing hypotheses concerning population parameters using sample data is called
a)
Exploratory research
b)
Descriptive research
c)
Descriptive analysis
d)
Inferential analysis
4.
The degrees of freedom for testing the equality of two population means assuming equal variance using a t test are
a)
n1 + n2
b)
n1 - n2
c)
n1 + n2 -1
d)
n1 + n2 - 2
5.
When we accept the null hypothesis when it is false we, are committing
a)
type 1 error
b)
type 2 error
c)
neither type 1 nor type 2 error
d)
none of the above is true
6.
The degrees of freedom for the t test to test the hypothesis about paired sample are
a)
n
b)
n1 + n2
c)
n1 + n2 - 2
d)
n-1
7.
If a hypothesis is rejected at 5%
a)
It must be rejected at 10%.
b)
It must be rejected at 2%
c)
Both a & b are correct.
d)
All the statements are wrong.
8.
The t distribution could be used
a)
When sample size is small ( n < 30)
b)
Sample is drawn from a normal population
c)
Population variance is unknown
d)
All the above statements are correct.
9.
Which of the following statistics is computed as the ratio of between sum of square to within sum of squares?
a)
z statistic
b)
t statistic
c)
f statistic
d)
chi-square statistic
10.
The number of degrees of freedom in a Chi-square table with 3 rows and 4 columns are
a)
12
b)
6
c)
7
d)
3
11.
The test of significance for which of the following parameters is conducted by non-parametric test.
a)
Mean
b)
Median
c)
Mode
d)
Standard deviation
12.
Parametric tests cannot be conducted if
a)
Normality assumption is not satisfied
b)
Data is nominal or ordinal in nature
c)
Information on increase or decrease is given by a plus or minus sign instead of actual number
d)
All of the above are true
13.
When data arranged in an ascending order of magnitude reveal that 19th, 20th 21st and 22nd observations have the same value, the rank assigned to each of these observations is
a)
21.5
b)
21
c)
20.5
d)
20
14.
Using the standardized normal table supplied with this exam determine what Z value would be used to set up a confidence interval at the 95 percent confidence level.
a)
0.05
b)
1.05
c)
1.96
d)
1.65
15.
Which of the following is not a step in calculation of the chi-square statistic?
a)
Calculate the sample mean.
b)
Formulate the null hypothesis and determine the expected frequency of each answer.
c)
Determine the appropriate significance level.
d)
Calculate the chi-square value.
16.
A researcher was interested in stress levels of lecturers during lectures. She took the same group of 8 lecturers and measured their anxiety (out of 15) during a normal lecture and again in a lecture in which she had paid students to be disruptive and misbehave. The data were not normally distributed. Which test should she use to compare her experimental conditions?
a)
Paired samples t-test
b)
Mann–Whitney test
c)
Wilcoxon rank-sum test
d)
Wilcoxon signed-rank test
17.
A researcher measured the same group of people’s physiological reactions while watching horror films and compared them to when watching action films, and a documentary about wildlife. The resulting data were skewed. What test should be used to analyse the data?
a)
Independent analysis of variance
b)
Friedman’s
c)
Kruskal–Wallis test
d)
Wilcoxon signed-rank test
18.
An independent–samples t test is to be run on a small data set (n = 20; N = 40) to compare the mean scores of two groups of participants, a Drug group and a Placebo group. The scientific hypothesis is that the Drug group performs at a higher level
a)
For a one–tailed test, the critical region will lie above the 95th percentile of the t distribution
b)
For a one–tailed test, the critical region will lie above the 97.5th percentile of the t distribution
c)
For a one–tailed test, the critical region will lie below the 5th percentile of the t distribution
d)
For a one–tailed test, the critical region will lie below the 97.5th percentile of the t distribution
19.
A bag contains 80 chocolates. This bag has 4 different colors of chocolates in it. If all four colors of chocolates were equally likely to be put in the bag, what would be the expected number of chocolates of each color?
a)
12
b)
11
c)
20
d)
9
20.
The chi-square test of independence relies upon what type of data?
a)
Measured data
b)
Percentages
c)
Categorical data
d)
Absolute values
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