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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.
q1. the discussion surrounding the anova is very important. this is a widely utilized statistical tool. what is the
What is the approximate estimated bootstrap standard error of the median, What is the approximate bias of the median estimated from bootstrapping - What is the bootstrap t confidence interval for the median
An automobile manufacturer claims the variance in the fuel consumption for its vehicles is less than the variance of similar type vehicles from another competitor.
Calculate the sample mean and sample standard deviation.
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
Equally likely chances of (1) increasing in value, (2) decreasing in value, or (3) remaining the same value. Calculate the probability at least one of the stocks increase in value.
Assuming the standard deviation of the populaiton is 0.8 year, find the 99% confidence interval estimate for the population mean.
Setup Null and Alternate hypotheses to test if average amount of soda in each can is less than 32 oz. Please test the hypothesis using a = 0.05.
Is this hardware retailer's sales significantly different from all retailers in the chain at p= .05? Are they significantly different at p= .01? Calculate a .95 confidence interval for the data in problem.
Determine the area under the normal curve with mu = 8 and sigma = 3. If Mary gets 90 on a physics test where mean is 85 and standard deviation is 4.59, where does she stand in relation to her classmates?
Find the mean and standard deviation of X, the number of students in class, who will develop influenza.
An airline estimates that 98% of people booked on their flights actually show up. If the airline books 76 people on a flight for which the maximum number is 74
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