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A Tamiami shearing machine is producing 10 percent defective pieces, which is abnormally high. The quality control engineer has been checking the output by almost continuous sampling since the abno
A certain type of new business succeeds 70 % of the time. Suppose that three such businesses open. What is the probability that all three businesses succeed?
In a test of hypothesis Ho: µ = 80 against Ha: µ ≠ 80, calculation showed that z = 1.76. Find the observed significance level.
What is the probability that a randomly selected individual is an adult? Are food preference and age statistically independent?
State the hypotheses that will help us determine whether a change occurred in the mean length of a work week.
two types of batteries x and y tested for their length life and the following result abtained: battery x :sample size 10,mean hour 1000,variance hour 100 and battery y: sample size 12,mean hour 102
Show the sampling distribution of if a random sample of 150 insured individuals is used to estimate the proportion having received at least one ticket.
body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds. How many people must be surveyed if we want to estimate the percentage who weigh more than 180
How many students would you include in a random sample to determine with 95% probability and to within 5% of the true value the proportion who arrive at 9am lectures without breakfast?
According to Money, the average appreciation, in percent, for stocks has been 4.3% for the five-year period ending in May 2007.5 An analyst tests this claim by looking at a random sample of 50 stock
If the safety commission determines that an elevator design is safe if its operating load is exceeded less than 0.05% of the time, does this prototype meet these saftey guidelines?
Suppose you wish to test the claim that μ is different from 113.9. Given a sample of n = 218 and a significance level of = 0.10, what criterion would be used for rejecting the null hypothesis? As
If two televisions are randomly selected, compute the probability that both televisions work. what is the probability at least one does not work?
A machine is supposed to mix peanuts, hazelnuts, cashews and pecans in the ratio 5:2:2:1. A can containing 500 of these mixed nuts was found to have 269 peanuts, 112 hazelnuts, 74 cashews, and 45 pe
Conduct a regression analysis to predict course grade (dependent variable) on the basis of the placement test score (independent variable)
Suppose a certain graduate school wants to redefine their admission standards. One aspect of admission is their score on the quantitative section of the GRE. Assume that GRE quantitative scores are
Suppose that the waiting time for a license plate renewal at a local office of a state motor vehicle department has been found to be normally distributed with a mean of 30 minutes and a standard dev
Develop a test of hypothesis to determine if the mean time spent in the mall is more than 0.75 hours. Use the .05 significance level.
what is the probability that: Fewer than two troubles will be repaired on the same day?
To test whether there is a tendency for cancer patients to hold on to life long enough to survive. Calculate the sample proportion of women who died in the week before Christmas.
Use the appropriate normal distribution to approximate the resulting binomial distributions. A convenience store owner claims that 55% of the people buying from her store, on a certain day of the we
The mean number of books each professor has. How many professors must the anthropologist sample to obtain an average accurate to within 14 books per professor?
In a sample of 855 bartenders, 48% heard complaints from patrons about work. If the margin of error was 4.4%, what was the confidence level that was used?
The amount of time it takes to take your order at the local Whaters restaurant. What is the probability that the mean time spent per customer is at least 3 minutes?
A field researcher is gathering data on trunk diameters of mature pine and spruce trees in a certain area. The follow results were obtained. Can he conclude at alpha=0.05, that the average trunk siz