May I please get help in answering the following homework questions? Thank you.

Question 7: In general, higher confidence levels provide

1. wider confidence intervals
2. narrower confidence intervals
3. a smaller standard error
4. unbiased estimates

Question 8: In developing an interval estimate, if the population standard deviation is unknown

1. it is impossible to develop an interval estimate
2. the standard deviation is arrived at using the range
3. the sample standard deviation can be used
4. it is assumed that the population standard deviation is 1

Question 9: If the mean of a data set is zero, then the standard deviation

1. must also be zero
2. must be 1
3. can be any value
4. can be any positive vaue

Question 10: If two groups of numbers have the same mean, then

1. their standard deviations must also be equal
2. their medians must also be equal
3. their modes must also be equal
4. None of these alternatives is correct.

Question 11: is an example of a

1. population parameter
2. sample statistic
3. population variance
4. mode

Question 12: The mathematical equation relating the independent variable to the expected value of the dependent variable; that is, E(y) =₀+₁x, is known as

1. regression equation
2. correlation equation
3. estimated regression equation
4. regression model