
Unit 5 - II Mat. Stat.
Authored by sr. celestine
Mathematics
University
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The t-distribution is used when:
Sample size is large
Population variance is known
Sample size is small and population variance is unknown
The data is non-numeric
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The t-distribution approaches the normal distribution as:
Degrees of freedom increase
Sample size decreases
Variance increases
Mean becomes zero
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
For a t-distribution, degrees of freedom is:
n + 1
n
n - 1
2n
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
For testing the difference of two means using t-test, the samples must be:
Independent
Dependent
Always equal
Large
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The formula for one-sample t-test statistic is:
t = x̅ - μ / s /√n
t = x̅ + μ
t = s / x̅
t = μ / x̅
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In small samples, the standard deviation used is:
σ
Sample standard deviation (s)
Mean
Variance
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A paired t-test is used when:
Two groups are independent
Two groups are the same and matched
Population is known
n > 30
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