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The manager of a pizza parlor claims his employee's make an average of $4.50 per hour with a standard deviation of $0.75. Bob does not believe his claim, so he takes a sample of 50 employees and finds their average salery is $4.25. Test the managers claim at alpha= 0.02.
Perform a test to determine whether there is sufficient evidence to support a claim of a linear correlation between two variables. Find the critical values of r given the number of pairs of data n and the significance level alpha.
question a process for the manufacture of penicillin was studied. there were five variants of the basic process being
In this the anniversary of the sinking of the Titanic, it is interesting to look at the distribution of those who survived, and those who died. The table below describes the number of men, women and children who were passengers on the Titanic.
If a proposal evaluator randomly selected two proposals, what is the probability that both of them met the specified?
In relative frequency histogram for a large set of GPAs, the mean and the standard deviation are 2.10 and 0.21 respectively. What proportion of GPAs falls within 1.68 and 2.52?
The share of the national car manufcturers market in South Africa is shown in the table below:
Four percent of the customers of a store buy cigars. Half of the customers who buy cigars buy beer and one fourth of those who buy beer buy cigars. The table is given below:
The smallest quantity in a cell is minus 35, but two different cells with minus signs have 35 units in them. What problem will this cause and how should this difficulty be resolved?
Their probabilities for success on a single play are p for A and q for B, and successive plays are independent. Determine the probablity that A wins the contest given A plays first.
Suppose we have observations x1, x2, . . . , xn. Prove that the sum of deviations of the observations from their arithmetic mean is always equal to zero.
Survey on marital status to determine whether the data is qualitative or quantitative
The cost of each book is a random variable with mean 30. What is the expected value of his total expenditure? Find the joint PMF of K and N. Find the marginal PMF of N.
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