WorksheetsStatistics basic 001
Total questions: 28
Worksheet time: 1hrs 24mins
Name
Class
Date
1.
Which of the following is a measure of central tendency?
a)
Standard deviation
b)
Median
c)
Range
d)
Variance
2.
Which of the following is a measure of dispersion?
a)
Mean
b)
Median
c)
Standard deviation
d)
Mode
3.
If the range of a data set is 12, what does it represent?
a)
The difference between the highest and lowest values
b)
The average of all the values
c)
The most frequently occurring value
d)
The spread of values around the mean
4.
The interquartile range is a measure of:
a)
Central tendency
b)
Variability
c)
Skewness
d)
Normality
5.
What does a standard deviation of zero indicate?
a)
The data set has a large spread
b)
All the values in the data set are the same
c)
The data set is normally distributed
d)
The data set has a positive skew
6.
Which of the following measures of central tendency is influenced by extreme values?
a)
Mean
b)
Median
c)
Perfect negative relationship
d)
Range
7.
A negatively skewed distribution has its tail pointing towards the:
a)
Left
b)
Right
c)
Center
d)
None of these
8.
The correlation coefficient ranges between:
a)
-1 and 1
b)
0 and 1
c)
-1 and 0
d)
0 and infinity
9.
A correlation coefficient of -0.8 indicates:
a)
A strong positive relat
b)
A weak negative relationshipionship
c)
No relationship
d)
Perfect negative relationship
10.
The p-value in hypothesis testing represents:
a)
The probability of committing a Type I error
b)
The probability of committing a Type II error
c)
The level of significance
d)
The strength of the relationship
11.
Which statistical test is used to compare means of two independent groups?
a)
Independent samples t-test
b)
Paired samples t-test
c)
Analysis of variance (ANOVA)
d)
Chi-square test
12.
A one-way ANOVA is used when:
a)
Comparing means of two independent groups
b)
Comparing means of three or more independent groups
c)
Comparing means of two dependent groups
d)
Analyzing correlation between two variables
13.
Which of the following is not an assumption of parametric tests?
a)
Normal distribution of data
b)
Homogeneity of variances
c)
Independence of observations
d)
Nonlinearity of the relationship
14.
A type II error occurs when:
a)
A true null hypothesis is rejected
b)
A false null hypothesis is rejected
c)
A true alternative hypothesis is accepted
d)
A false alternative hypothesis is accepted
15.
Which statistical test is appropriate for analyzing the association between two categorical variables?
a)
Chi-square test
b)
Independent samples t-test
c)
Analysis of variance (ANOVA)
d)
Pearson correlation coefficient
16.
What does the p-value represent in hypothesis testing?
a)
The probability of observing the obtained result if the null hypothesis is true
b)
The probability of observing the obtained result if the alternative hypothesis is true
c)
The probability of observing a result in the opposite direction of the obtained result
d)
The probability of committing a Type I error
17.
In an experimental study, the independent variable is:
a)
Manipulated by the researcher
b)
Measured by the researcher
c)
Observed without any intervention
d)
Controlled by external factors
18.
Which of the following is a non-parametric statistical test?
a)
Student's t-test
b)
Analysis of variance (ANOVA)
c)
Mann-Whitney U test
d)
Chi-square test
19.
What is the purpose of a control group in an experiment?
a)
To provide a baseline for comparison
b)
To eliminate extraneous variables
c)
To ensure random assignment of participants
d)
To increase statistical power
20.
In a normal distribution, approximately what percentage of values fall within one standard deviation from the mean?
a)
68%
b)
75%
c)
95%
d)
99.7%
21.
What is the purpose of a scatter plot?
a)
To visualize the relationship between two continuous variables
b)
To compare means of two independent groups
c)
To analyze the association between two categorical variables
d)
To determine the effect size
22.
The null hypothesis in a hypothesis test represents:
a)
The absence of a relationship or difference
b)
The presence of a relationship or difference
c)
The alternative hypothesis
d)
The research hypothesis
23.
A z-score represents:
a)
The number of standard deviations a value is from the mean
b)
The number of standard deviations a sample is from the population
c)
The effect size in a statistical test
d)
The probability of observing a value in a distribution
24.
A p-value of 0.05 indicates:
a)
The probability of obtaining the observed result by chance is 5%
b)
The probability of obtaining the observed result by chance is 95%
c)
The null hypothesis is true
d)
The alternative hypothesis is true
25.
In a hypothesis test, the alpha level is:
a)
The level of significance set by the researcher
b)
The probability of committing a Type I error
c)
The probability of committing a Type II error
d)
The strength of the relationship
26.
A confidence interval of 95% means:
a)
There is a 95% chance the true population parameter lies within the interval
b)
There is a 5% chance the true population parameter lies within the interval
c)
The sample mean is significantly different from the population mean at the 5% level
d)
The sample mean is significantly different from the population mean at the 95% level
27.
A type I error occurs when:
a)
A true null hypothesis is rejected
b)
A false null hypothesis is rejected
c)
A true alternative hypothesis is accepted
d)
A false alternative hypothesis is accepted
28.
What does the term "statistical significance" refer to?
a)
The likelihood that the results are due to chance
b)
The practical importance of the results
c)
The generalizability of the results to the population
d)
The reproducibility of the results
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