Which is a true statement about Confidence Intervals

Expresses extent of potential variation in point estimate

Which statement is correct?

Hypothesis tested in 2 directions is 2 tailed test

Which is a correct statement about the SE (standard error)

The larger the sample, the smaller the SE

Which is a correct statement about hypothesis testing?

Type I error: probability of falsely rejecting the null

Which is the false statement

Most research involves populations not samples

Which one of the following results would you be most confident in that there is an association

OR = 1.89 (95% CI = 1.81 - 1.95)

Which statement is false?

Larger samples have larger Standard Errors

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TIME 3 Epi/Biostat Review

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Epi and Biostat Review Medical Students

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Questions 13

Answers

1
Which is a true statement about Confidence Intervals
Small samples usually lead to narrow confidence intervals
Cannot be used to determine statistical significance
Expresses extent of potential variation in point estimate
2
Your research hypothesis
critical hypothesis
null hypothesis
alternative hypothesis
alpha hypothesis
3
In a negatively skewed distribution
The tail is on the right
The tail is on the left
Most of the scores are at the lower end of the distribution
The mean is greater than the mode
4
Which statement is correct?
Hypothesis tested in 2 directions is 2 tailed test
A 2 tailed test is rarely used
1 tailed test are used when your data is skewed
1 tailed test is always based on a negative critical value
5
Which is a correct statement about the SE (standard error)
The larger the sample, the smaller the SE
Less variability in the population, the larger the SE
Larger SE, more reliable the sample statistic
SE = √SD/n
6
Which of the following is the study of disease determinants and their prevalence?
Health Policy
Epidemiology
Biostatistics
Community Health
7
Which is a correct statement about hypothesis testing?
Type II error: probability of falsely rejecting the null
p value is the (beta) type II error
Type I error: probability of falsely rejecting the null
Type I is false negative error
8
Which is the false statement
Most research involves populations not samples
Data describing a sample are referred to as statistics
Statistics are used to estimate a parameter
Data describing a population are referred to as parameters
9
Smaller the p value, less likely sampling variability accounts for the group differences
true
false
10
Which one of the following results would you be most confident in that there is an association
OR = 1.89 (95% CI = 1.81 - 1.95)
OR = 9.85 (95% CI = 0.89 - 36.48)
OR = 1.91 (95% CI = 1.02 - 2.89)
OR = 0.95 (95% CI = 0.70 - 1.29)
11
Which statement is false?
Standard Deviation (SD) is a parameter
Larger samples have larger Standard Errors
Upper limit for 95% CI of a sample mean = mean +1.96(SD/√n)
Standard Error (SE) is a statistic
12
In a cohort study of a disease, the sample selected is based on recruiting
Subjects without the factor under investigation
Subjects without the disease
Subjects with the disease
Subjects with the factor under investigation
13
Which is the widest confidence interval (given same SD and N)
95 % confidence interval
99 % confidence interval
90 % confidence interval

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