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The mean height of a certain kind of plant is 184 centimeters. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs from 184. State the null hypothesis H 0 and the alternative hypothesis H 1 that we would use for this test. Determining null and alternative hypotheses for the height of a plantH 0 =?H 1 =?
Research shows that the life time of Everlast automobile tires is normally distributed with a mean value of 70,000 miles and a standard deviation of 7,000 miles. What is the probability of having a tire that lasts more than 80,000 miles?
A breakdown of the responses is shown in the accompanying table. Is there evidence at the 10% level to infer that the responses differ among the three groups of employees?
Estimate the values using multiple regression models. An air conditioning as well as heating repair firm conducted a study to determine if the outside temperature, Illustrate the forecasted monthly electric bill.
The average shaft size for the E300 electric motor is .55 inch, with a standard deviation of .10 inch. It is normally distributed. What is the probability that a shaft selected at random will be between .55 and .65 inch?
Gender differences in dream content are well documented (Winget & kramer, 1979). Suppose a researcher studies aggression content in the dreams of men and women.
If the service manager wants to 95% confident that the overall time is correctly estimated, with a 3 percent probability of error, what sample size should be taken.
From a random sample we know that the average duration of unemployment in a low developed region A is 147 days (with standard deviation sA = 32 days and nA = 230 unemployed).
What is the equation for this regression model?
Create a scenario where the binomial probability formula could be used to determine the probability of some number of successes, x, in some given number of trials,n.
Suppose that distribution of grades has average of 78 with standard deviation of 11. Find the appropriate cutoff points for the grades A and F.
Suppose the probability of a boy being born is the same as the probability of a girl being born. Find the probability that a family with three children will have two boys and one girl.
Illustrate what does weighting add to usefulness of moving averages and explain how is it done. The yield on a thirty year treasury note at the end of every year since 1990 is recorded below.
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