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

Put your comment

Ask Question & Get Answers from Experts
Browse some more (Basic Statistics) Materials
Choose a business or organizational problem that you may be able to solve with Quantitative Analysis techniques.   Do a survey of literature on your topic or problem and inc
Conceptually we would expect the probability of newborn males and females to be the same. However, census reports indicate that the ratios of males and females in various co
A grab bag contains 10 $1 prizes, 7 $5 prizes, and 3 $20 prizes. three are chosen at random. find the probability that exactly two $20 prizes are chosen?
Calculate the maximum horizontal shear stress if the member is subjected to a maximum vertical shear of 4500 lb- Calculate the section modulus with respect to the X-X axis for
Jolie takes 45 minutes to do her statistics homework. If the mean is 38 minutes and the standard deviation is 3, calculate Jolie's z score. Once calculated, interpret your f
The rate of neurotoxicity over the period of the trial is estimated to be about 40% in the placebo group, and the hypothesis is that this new agent lowers the toxicity rate
Mr. Pickwick takes his umbrella. When rain is not forecast, he takes it with probability 1/3. Find: (a) the probability that Pickwick has no umbrella, given that it rains.
Plot the data. Does the trend in lean over time appear to be linear?- What is the equation of the least-squares line? What percent of the variation in lean is explained by