4. A study found that the average time it took a person to find a new job was 5.9 months. If
sample of 36 job seekers was surveyed, construct the 99% confidence interval of the mean of all
job seekers to find a new job. Assume the standard deviation is 0.8 months.
5. A survey of 80 recent fatal accidents showed that 46 were alcohol related.
a) Find the point estimate.
b) Verify that the requirements for constructing a confidence interval for p are satisfied.
c) Construct a 99% confidence interval of the proportion of all fatal alcohol-related accidents.
e ma
6. My husband Tim, an avid golfer, claims that his average drive is greater than 250 yards. To
prove this, he measured 9 drives from a round of golf. Here are this distances, in yards.
262
247
255
239
275
257
260
242
248
Construct an 80% confidence interval for the mean length of all of Tim's drives.