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Q1. In a recent study of 250 female freshmen showed that 70 did not want to work after marriage. Find the 95% confidence interval of the true proportion.
Q2. Find the 99% confidence interval for the variance and standard deviation for the lifetime of batteries if a sample of 40 has a standard deviation of 3.4 months. Assume the variable is normally distributed.
Q3. A researcher wishes to test the claim that the average age of lifeguards is greater than 22 years. The researcher sampled 56 lifeguards and found an average of 23.7 years with a standard deviation of 2 years. Test the claim at "alpha" = 0.05.
Q4. Ten randomly selected cars were stopped and the tread depth of the left front tire measured. The mean was 0.12 inch, and the standard deviation was 0.02 inch. Find the 90% confidence interval of the mean depth.
the triton energy corporation explores for and produces oil and gas. company president gail freeman wants to have her
When writing about the probability that it will rain in Boston on July 4 of next year, a newspaper reporter states that the probability is ½, because either it will rain or it will not.
A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is:
random number generation using discrete probability distribution.the time between arrivals of cars at the petroco
From this group of 2000 accounts what is the probability that an account has a balance of $500 or more, given that it is 3 or more years old?
The number of passengers arriving at an airport terminal average 1200 each hour. To process passengers (check in, take luggage, etc) take an average of 6 minutes each. There are 6 airport staffers processing passengers. How long is the average wai..
In a recent study, a random sample of children in grades two through four showed a significant negative relationship between the amount of homework assigned and student attitudes. What is the explanatory variable and what is the response variable?
Six groups of randomly selected students matched for IQ and age were formed. Each student was taught a concept of time by using one of three methods: Lecture, demonstration
Explain the difference between a discrete and a continuous random variable. Give two examples of each type of random variable.
A simple random sample of 64 observations was taken from a large population. The sample mean and the standard deviation were determined to be 320 and 120 respectively. The standard error of the mean is?
What is the null hypothesis? Use α =0.05. Compute critical value. Use α =0.05.
You are interested in whether men participate more than women in political activities, so you survey 632 men and 675 women and ask them how many political events they attended within the past year. Here are your results.
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