+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
Suppose we have run a regression on 48 months of data and the regression equation is Y = 50000 + 1000*x (where x is the month number).
A random sample of 90 printers discovered that 25 of them were being used in small businesses. Find the 95% limit for the population proportion of printers that are used in
Ccompute the test statistic, and at 95% confidence, test the hypotheses. What is the p-value associated with the sample results? What is your conclusion based on the p-value?
A particular medical operation proves fatal in 1% of the cases. Find an approximation to the probability that there will be at least 2 fatalities in 200 operations.
A sample, in hour's of life, is as follows:: 123, 116, 122, 110, 180, 126, 125 Find all Measures of Location (Central Tendency) and Measures of Variability (Dispersion or Va
A production process produces 90% non-defective parts. A sample of 10 parts from the production process is selected. What is the probability that the sample will contain 7 non
What is the probability that the mean breaking strength of the 3 untreated specimens is at least 25 pounds greater than the mean strength of the 3 treated specimens?
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? Compute the value of the test statistic.