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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
Children in the top 25% are considered accelerated readers as well as qualify for different placements in school. What raw score would mark the cutoff for such placement?
In a random sample of 150 clerical workers, 30 exhibit an intense dislike for their jobs. Compute a 94% confidence interval for the proportion of clerical workers who exhibit an intense dislike for
In the random sample of 150 clerical workers, 30 exhibit an intense dislike for their jobs. Compute a 94% confidence interval for the proportion of clerical workers who exhibit an intense dislike fo
Assume that prices of certain model of new homes are normally distributed with mean of $150,000. Determine the percentage of buyers who paid more than $154,800 if the standard deviation is $2,400
Richard has been given 7-question multiple-choice quiz in his history class. Each question has three answers, of which only one is correct. Since Richard has not attended the class recently, he does