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A polling agency wants to determine the size of a random sample needed to estimate the proportion of homeowners who keep a hand gun in their home for security.
Suppose that the probability that a person between the ages of 19 and 24 checks their daily horoscope is 0.12. If 400 randomly selected people between the ages of 19 and 24 were asked "Do you check
For a hypothetical magazine, the probability that the reader is male given that the reader is at least 35 years old is 0.30. The probability that a reader is male, given that the reader is under 35,
Is the number of visits significantly less for the dog owners than for the participants in the control group? Use a one tailed test with alpha level set at p<.05
A previous study indicates that the percentage of chain smokers, p, who have lung cancer follows a beta distribution with mean 70% and standard deviation 10%. Suppose a new data set collected shows
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 385 hours. The population standard deviation is 84 hours.
Now suppose the incidence of the disease in another population segment is 30%. Compute the probability that the person actually has the disease, given that his/her test is positive; Ans.
A machine produces ball bearings is set so that the average diameter is .50 inch. A sample of 10 ball bearings was measured with the results shown here. Assuming that the standard deviation is .05 i
The equation of the estimated regression line that relates the response (dependent) y-variable (cash bonus) to the predictor (independent) x-variable (annual pay) is
The null and alternate hypotheses is: H? : µ = 20; H? : µ > 20- (I think this is correct). Calculate the p-value using t-distribution (exact value): 0.1577 (What I calculated)
A organic food company wants to determine the best process for blanching dark green vegetable material so it can be added to other food products without losing vitamin A. They are examining three di
The amount of coffee dispensed in a paper cup of a vending machine is normally distributed with a mean of 4.5 oz. and standard deviation of 0.2 oz. What percent of all the paper cups will have more
If you find that the average number of people entering the store each day since Michelle was hired is different from what it was before Michelle was hired, estimate the average number of people ente
Suppose we roll a fair die two times. a. How many different samples are there? b. List each of possible samples. Compute the mean and the standard deviation of sample means and the distribution of p
The data below are the ages and systolic blood pressure (measured in millimeters of mercury) of 9 randomly selected adults. Age, x 38 41 45 48 51 53 57 61 65 Pressure, y 116 120 123 131 142 145 148
Amoung all auto shops in San Antonio, a claim is made that the mean time needed to rotate the tires on a car is 16 mintues. A study of 20 auto shops revealed a mean time of 17 minutes with a sample
The following data represents the time it takes a company to respond to an account inquiry for opening a new account. Using the exponential distribution estimate the average waiting time using the sam
A. Calculate the least squares estimates of the slope and intercept and calculate sigma^2. B> use the equation of the fitted line to predict what gpa would be expected when the SAT score is 32. C
Boeing has developed a new drilling tool that drills hole for riveting on the 787 wings. The standard deviation of hole diameter should be small enough to ensure that the rivet will fit.
Suppose heights of males are normally distributed with a mean of 69.1 inches and a standard deviation of 3.2 inches. John's height is 77.6 inches. How many standard deviations is John's Height from
Find the number z such that 28% of all observations from a standard normal distribution are greater than z
What is the proability that a randomly selected automobile built this particular year gets more than 19.66mpg? (round 4 decimal places)
Maria collected data on amount spend for entertainment each week, on average. After constructing a histogram, Maria noticed her data was skewed towards higher amounts.
Suppose test scores for a test are uniformly distributed between 51 and 95. Let x=test scores. What is the probability a test score is at least 68?
What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) Reject Ho if z <