Homework Sourse1 Which of the following can be used to show a causeandeffec
1. Which of the following can be used to show a cause-and-effect relationship between two variables?
a census
a controlled experiment
an observational study
a sample survey
a cross-sectional survey
2. In a hypothesis test, a P-value is
the probability that the null hypothesis is true
the probability that the alternative hypothesis is true
the probability that the population fits a normal distribution
the probability that we would get a sample result at least as extreme as the one we got, given that the null hypothesis is true
3. According to the Central Limit Theorem, as n increases, the distribution of sample means (x-bar) approaches
the population distribution.
a normal distribution.
a uniform distribution.
4. Which of the following is not a measure of spread or variability of a data set?
standard deviation
variance
Q3
IQR
| a census | ||
| a controlled experiment | ||
| an observational study | ||
| a sample survey | ||
| a cross-sectional survey |
Solution
1. a controlled experiment
2. the probability that we would get a sample result as it least as extreme given that the null hypothesis is true
3. a normal distribution
4. Q3
