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A study of 35 professors showed that average time they spent creating test questions was 13.5 minutes per question. The standard deviation of population is 3.8. Which of the following is the 99% con
The average number of years served by those 35 justices was 13.8. If the standard deviation of overall population is 7.3 years, determine the 95% confidence interval for the average number of years
Use the information below to estimate the expected return on the stock of W.M. Hung Corporation.
A set of 50 data values has the mean of 45 and a variance of 9. Determine the standard score (z) for data value = 52.
The claim is that the proportion of drowning deaths of children attributable to beaches is more than 0.25, and the sample statistics include n = 615 drowning deaths of children with 30% of them att
Determine the mean and SD for this data? Please employ language I can understand for working out this problem, thanks. I have to know how to figure this on my own.
An ecologist claims that because of environmental influences, the mean life of Louisiana shellfish is 27 months. Feeling the claim is too low, a congressman decides to test the ecologists claim at a
Read the t statistic from table of t distributions and circle the correct answer. A one tailed test (lower tail). a sample of 10 at a 0.10 level of significance; t=
The carburetors on Fords have 0.09 probability of failure, those on Renaults have 0.05 chance and those on Hondas have 0.02 chance of failure. If car with failed carburetor is selected at random, wh
Claim: µ = 978. Sample data: n = 23, = 934, s = 30. The sample data appear to come from a normally distributed population with s = 30.
Full time Ph.D. students receive average $12,837 per year. If the average salaries are normally distributed with standard deviation of $15,000 determine these probabilities.
Determine a 95% confidence interval for true mean annual income of nursing school alumni. Write down a statement about the confidence level and the interval you find.
An auditor wants to estimate what proportion of a bank's commercial loan files are incomplete. The auditor randomly samples 60 files and finds 12 are incomplete.
At the drive through window of bank it's found that 10 customers get served every 15 minutes. The bank's manage is interested in finding a way to increase the number of customers that can be served.
A computer manufacturer claims that chips it makes are so accurate that there is only 1/2000 probability of getting defective chip. A salesman at a local store bought 5 chips and claimed that 2 of
A research shows that employee salaries at the company XYX, in thousands of dollars, are given by equation y-hat= 48.5 + 2.2 a + 1.5 b where ‘a' is years of experience, and ‘b' is the e
A researcher is interested in studying people's mean age in certain region. If the population standard deviation is known to be eight years and 1.5 year of error margin is allowed, Determine the min
The ages of ten students are listed in years:{ 17,22,19,24,21,23,29,18,22,28 } Compute the mean, median, mode, sample variance, and range.
Determine a 98% confidence interval for true proportion of defective product. Show your computations and/or explain the process employed to obtain the interval.
A bank manager wanted to determine the mean number of transactions businesses make per month. For a sample of 55 businesses, he found that mean number of transaction per month to be 32 and the stand
The monthly utility bills are normally distributed with the mean value of $150 and standard deviation of $20.
At a jewelry store, the probability for a customer to make a purchase when entering the store is 35%. We asked 25 customers enter the store whether they made a purchase or not.
A pizza restaurant manager claims that average home delivery time for their pizza is no more than 20 minutes. A random sample of 49 home delivery pizzas was gathered. The sample mean was found to be
An experiment was conducted to find out the strength of a certain type of braided cord after weathering. The strengths of 56 pieces of cord that had been weathered for 30 days were investigated.
A telephone answering service records length of each call. A random sample of 12 reports yields mean length of 3.2 minutes with standard deviation of .7 minute. Compute a 95% confidence interval fo