Batch 2 - May I please get help/guidance with the following homework question? Thank you for your help.

6.When the level of confidence decreases, the margin of error

a.Stays the same

b.Becomes smaller

c.Becomes larger

d.Becomes smaller or larger, depending on the sample size

7.In general, higher confidence levels provide

a.wider confidence intervals

b.narrower confidence intervals

c.a smaller standard error

d.unbiased estimates

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

a.it is impossible to develop an interval estimate

b.the standard deviation is arrived at using the range

c.the sample standard deviation can be used

d.it is assumed that the population standard deviation is 1

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

a.Must always be zero

b.Must be 1

c.Can be any value

d.Can be any positive value

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

a.their standard deviations must also be equal

b.their medians must also be equal

c.their modes must also be equal

d.none of these alternatives is correct