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1. For the ages in Exercise 1:
a) Construct a 95% confidence interval for the mean age of all customers, assuming that the assumptions and condi- tions for the confidence interval have been met.
b) How large is the margin of error?
c) How would the confidence interval change if you had assumed that the standard deviation was known to be 10.0 years?
2. For the purchase amounts in Exercise 2:
a) Construct a 90% confidence interval for the mean pur- chases of all customers, assuming that the assumptions and conditions for the confidence interval have been met.
c) How would the confidence interval change if you had assumed that the standard deviation was known to be $20?
most major airlines allow passengers to carry two pieces of luggage of a certain maximum size onto the plane. however
For a group of 10 men subjected to a stress situation, the mean number of heartbeats per minute was 126, and the standard deviation was 4. Find the 95% confidence interval of the true mean.
Before 1918, in a random sample of 11 wolves spotted in the region, what is the probability that 8 or more were male?
The simplest useful numerical description of a distribution consists of measure of center and measure of spread. The Median is the 50th percentile. Q: Why is not the Mean the 50th percentile?
Calculate the standard deviation for this data = since it is a case of grouped data with classes. use group or class midpoints in the formula in place of x values.
a student believes that no more than 20 of the students who finish a statistics course get an a. a random sample of 100
the frequency distribution below shows the distribution for suspended solid concentrationin ppm in river water of 50
Assume that sigma = 60, choose an alpha level, and perform a hypothesis test to determine whether this is good evidence to conclude that the mean score for all young men is less than 275.
Possible test scores could range from 0 to 500. Assume that the scores are normally distributed. Find the probability that a student had a score higher than 320.
the world health organizations w.h.o. recommended daily minimum of calories is 2600 per individual. the average number
What happens to the confidence interval when we go from a 95% confidence level to a 99% confidence level? Is this desirable? When would we want to use a 99% confidence interval?
sketch the areas under the standard normal curve over the indicated intervals and find the specific areeas.a. to the
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