# Question: Exercise 8 6 reported heights in mm of 55 5 60 3 60 6

Exercise 8.6 reported heights (in mm) of 55.5, 60.3, 60.6, 62.1, 65.5, and 69.2 for six seedlings fourteen days after germination.

a. Using software or a calculator, verify that the 95% confidence interval for the population mean is (57.3, 67.1).

b. Name two things you could do to get a narrower interval than the one in part a.

c. Construct a 99% confidence interval. Why is it wider than the 95% interval?

d. On what assumptions is the interval in part a based? Explain how important each assumption is.

a. Using software or a calculator, verify that the 95% confidence interval for the population mean is (57.3, 67.1).

b. Name two things you could do to get a narrower interval than the one in part a.

c. Construct a 99% confidence interval. Why is it wider than the 95% interval?

d. On what assumptions is the interval in part a based? Explain how important each assumption is.

**View Solution:**## Answer to relevant Questions

Having estimated the mean amount of time spent watching TV in Example 6, we might want to estimate the mean for various groups, such as different religious groups. Let’s consider Muslims. A recent GSS had responses on TV ...For the FL Student Survey data file on the text CD, software reports the results for responses on the number of times a week the subject reads a newspaper: a. Is it plausible that μ = 7, where μ is the population mean for ...For the question, “How many children have you ever had?” use the GSS Website sda.berkeley.edu/GSS with the variable CHILDS to find the sample mean and standard deviation for the 2008 survey. a. Show how to obtain a ...Explain the reasoning behind the following statement: “In studies about a very diverse population, large samples are often necessary, whereas for more homogeneous populations smaller samples are often adequate.” ...A poll of a random sample of n = 2000 Americans by the Pew Research Center (www.peoplepress.org ) indicated that 36% considered themselves “born-again” or evangelical Christians. How would you explain to someone who has ...Post your question