Researchers studies the effect of a fertilizer on radish sprout growth. They randomly selected some radish seeds to serve as controls, while others were planted in aluminum planters to which fertilizer sticks were added. Other conditions were held constant between the two groups. The following table shows a summary of the heights of plants (in cm) 2 weeks after germination Compute a 95% confidence interval for the difference in mean heights between fertilized and unfertilized plants Which confidence interval has the largest margin of error [Circle One]: (a) 95% CI for the mean difference with sample size n1=n2=20 (b) 99% CI for the mean difference with sample size n1=n2=20 (c) 90% CI for the mean difference with sample size n1=n2=50
: Researchers studies the effect of a fertilizer on radish sprout growth. They randomly
selected some radish seeds to serve as controls, while others were planted in aluminum planters to
which fertilizer sticks were added. Other conditions were held constant between the two groups. The
following table shows a summary of the heights of plants (in cm) 2 weeks after germination
Compute a 95% confidence interval for the difference in
unfertilized plants
Which confidence interval has the largest margin of error [Circle One]:
(a) 95% CI for the mean difference with
(b) 99% CI for the mean difference with sample size n1=n2=20
(c) 90% CI for the mean difference with sample size n1=n2=50
Compute the required sample size for each of the two groups to obtain a margin of error of a
95% confidence interval in (iii) of length 0.1
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