Confidence Intervals and Sample Size

It makes the interval larger.

It makes the interval more variable.

It makes the interval smaller.

It has no effect on the interval.

0.40 to 0.80

0.50 to 0.70

0.45 to 0.75

0.30 to 0.60

160

80

320

40

55%

65%

60%

50%

It shows a familiar pattern.

It becomes less reliable.

It remains the same.

It becomes more unpredictable.

0.50 to 0.70

0.45 to 0.75

0.55 to 0.65

0.52 to 0.67

Larger samples are easier to analyze.

Larger samples are more diverse.

Larger samples are more trustworthy.

Larger samples are more expensive.

Using a small sample size

Using a true SRS

Using a voluntary sample

Using a convenient sample

The interval doubles.

The interval remains the same.

The interval is reduced to a tenth.

The interval is reduced to a fifth.

The interval is twice as large.

The interval is half the size.

The interval is four times larger.

The interval remains unchanged.