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
For all subsequent parts state the null and alternative hypothesis, write down the test statistics and their degrees of freedom, calculate the test statistics, find the p-va
According to Central Limit Theorem, how big of sample is essential to be sure sampling distribution of sample means is normally distributed.
Suppose that {X{t),t ≥ 0} is a Wiener process with drift coefficient M and diffusion coefficient σ2 = 1, where M is a random variable having a uniform distribution on the inte
All bags entering a research facility are screened. Ninety-seven percent of the bags that contain forbidden material trigger an alarm. Fifteen percent of the bags that do no
Find the Celsius temperature(to the nearest degree when Fahrenheit temperature is 9 degrees by solving the equation 59= 9/5 C +32, where F is the Fahrenheit temperature (in
Burnwood Tech plans to issue some $60 par preferred stock with a 6% dividend. A similar stock is selling on the market for $70. Burnwood must pay flotation costs of 5% of th
Santa Fe black on white is a style of pottery that occurs in about 61% of the pot shards found in the Bandelier National Monument area.
A uniform probability distribution is a continuous probability distribution where the probability that the random variable assumes a value in any interval of equal length is