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The congressman took the random sample of 16 shellfish and found the mean life to be 28.05 months with standard deviation of 2.8. Determine the p-value and conclusion?
The table below provides the calories from fat contained in burgers and chicken. Find out if there is a significant difference in calories from fat in two foods. Employ a significance level of 5%.
A researcher randomly chooses 6 fathers who have adult sons and records the fathers' and sons' heights to get the data below. Find out if sons are taller than their fathers at the = 0.1 level of sig
Reading readiness of preschoolers from impoverished neighborhood (n=20) was measured using a standardized test. Countrywide, the mean upon this test for preschoolers is 30.9, with SD = 2.08. What p
Read the t statistic from the 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=
What technique would be employed for making the pair wise comparisons?
The carburetors on Fords have the 0.09 probability of failure, those on Renaults have a 0.05 chance and those on Hondas have a 0.02 chance of failure. If a car with a failed carburetor is chosen at
Claim: µ = 978. Sample data: n = 23, = 934, s = 30. The sample data appear to come from the normally distributed population with s = 30.
The average time a person spends at Barefoot Landing Sea aquarium is 96 minutes. The standard deviation is 17 minutes. Assume the variable is normally distributed. If a visitor is selected at random
Full time Ph.D. students receive an average $12,837 per year. If the average salaries are normally distributed with the standard deviation of $15,000 find such probabilities.
SAT SCORES: The national average SAT score is 1019. If we suppose a normal distribution with Q=90, Determine the 90th percentile score?
A nursing school desires to determine the true mean annual income of its alumni. It randomly samples 120 of its alumni. The mean annual income was $58,700 with standard deviation of $1,500. Determin
An auditor wants to estimate what proportion of a bank's commercial loan files is incomplete. The auditor randomly samples 60 files and finds out 12 are incomplete.
At a drive through window of the bank it's found that 10 customers get served every 15 minutes. The bank's manage is interested in determine a way to raise the number of customers which can be serve
A computer manufacturer claims that the chips it makes are so accurate that there is only 1/2000 probability of getting a defective chip. A salesman at local store purchased 5 chips and claimed that
Teen Court is a juvenile diversion program designed to circumvent the formal processing of first-time juvenile offenders in the juvenile justice system. The article "An Experimental Evaluation of Te
A research shows which employee salaries at company XYX, in thousands of dollars, are given by the equation y-hat= 48.5 + 2.2 a + 1.5 b where ‘a' is the years of experience, and ‘b' is t
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
At a drive through window of the bank it's found that 10 customers get served every 15 minutes. The bank's manage is interested in finding a way to raise the number of customers which can be served.
Determine the mean, median, mode, sample variance, and range. Do you think that this sample may have come from the normal population? Why or why not?
Determine a 98% confidence interval for true proportion of defective product. Show your calculations and/or describe the procedure employed to obtain the interval.
Determine a 90% confidence interval for the mean number of business transactions per month. Show your calculations and/or explain the process used to obtain the interval.
The monthly utility bills are normally distributed with mean value of $150 and standard deviation of $20.
At a jewelry store, the probability for customer to make a purchase when entering the store is 35%. We asked 25 customers enter store whether they made a purchase or not.
Is there evidence to reject the manager's claim at alpha =.01? Perform a suitable hypothesis test, showing the necessary computations and/or explaining the process employed to obtain the results.