+1-415-670-9189
info@expertsmind.com
Confidence interval estimate for variance of life expectancy
Course:- Basic Statistics
Reference No.:- EM1317098


Assignment Help
Assignment Help >> Basic Statistics

Q1) A sample of 23 European countries found that variance of life expectancy was 7.3 years. Determine the 95% confidence interval estimate for variance of life expectancy in Europe?

a) 27.2 < σσ2 < 118.3

b) 5.6 < σ2 < 10.3

c) 4.4 < σ2 < 14.6

d) 28.9 < σ2 < 115.0

Q2) Determine the 95% confidence interval for standard deviation of lengths of pipes if sample of 26 pipes has standard deviation of 10 inches.

a) 14.0 < σ < 16.0

b) 7.8 < σ < 13.8

c) 74.0 < σ < 126.0

d) 60.8 < σ < 190.5

Q3)  Average gas mileage of certain model car is 26 miles per gallon.  If gas mileages are normally distributed with standard deviation of 1.3, determine the probability that randomly selected car of this model has gas mileage between 25.8 and 26.3 miles per gallon.

a)   0.15

b)  0.85

c)  0.70

d)  0.30

Q4) At large department store, average number of years of employment for cashier is 5.7 with standard deviation of 1.8 years. If number of years of employment at this department store is normally distributed, determine the probability that cashier chosen at random has worked at the store for over 10 years?

a) 0.4916

b) 0.9916

c) 0.0084

d) 0.0054

Q5)  To be accepted into top university, applicants should score within top 5% on the SAT exam.  Given that SAT test scores are normally distributed with mean of 1000 and standard deviation of 200, compute the lowest possible score a student needs to qualify for acceptance into the university?

a) 1330

b) 1400

c) 1250

d) 1100


Ask Question & Get Answers from Experts
Browse some more (Basic Statistics) Materials
Find the mean, median, and range for each of the two data sets. b.Find the standard deviation using the rule of thumb for each of the data sets.
a.There is less than 7 beds per house in Compton; Decision in to reject the null hypothesis b. 30 % of Americans go to church on Sundays. Decision is not to reject the null hy
Is there enough evidence to reject the claim that the average cost of a home in both locations is the same? Use α = 0.01. Clearly mark each of the five steps in hypothesis t
Construct a 89% confidence interval estimate of the overall percentage of the B.C. population in favour of such a casino and what size of sample would be required to do this
Suppose we drew a histogram of these 18 death rates using class intervals 1 — 1.9, 2 — 2.9, 3 — 3.9, 4 — 4.9 and 5 — 5.9. Using the histogram, we would
Assuming that the distribution of the costs is normal, what is the probability that the average for this sample is between $400 and $425?
A woman has n keys, of which one will open her door. (a) if she tries the keys at random, discarding those that do not work, what is the probability that she will open the d
When formulating the conclusion to the test, why is the phrase fail to reject the null hypothesis more accurate than the phrase accept the null hypothesis?