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A manager wishes to find out whether there is a relationship between the number of radio ads aired per week and the amount of sales of a product. the data for the sample are shown below
No of ads X: 2 5 8 8 10 12Sales Y : 2 4 7 6 9 10
For a standard normal curve, find the z-score that separates the bottom 90% from the top 10%.
A system consists of five identical components connected in parallel. Determine the reliability of the components such that the system reliabilty is 97%.
The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments, property taxes, and utility costs (water, heat, electricity).
If the writing scores for the population have a standard deviation of σ = 20, does the sample provide enough evidence to conclude that the new composition course has a significant effect?
Using What's Best! (Or solver) find the least-cost matrix.
A company sells two products (Product 1 and Product 2) that tend to be substitutes for each other. That is, if a customer buys Product 1, she tends to not buy Product 2, and vice versa.
If the least squares equation for sales data going from 1984 to 1990 is Y1 = 10 + 1.3X (in $ millions) found using the coded method, what is the plot on the straight line for 1988? (x and y values)
In a poll of 1049 adults, it was found that 21% smoked cigarettes in teh past week. Use a 0.05 significance level to test the claim that less than 25% of adults have smoked within the past week.
Consider the following data on 20 chemical reactions, with Y = chromatographic retention time (seconds) and X = molecular weight (gm/mole).
Assume a one-tailed t -test is being applied to determine if population mean is less than $212. Level of significance chosen is 0.01 and 26 accounts are sampled. Determine the critical value?
In certain normal distribution of scores, mean is 50 and standard deviation is 4. Determine z-score corresponding to a score of 55.
Graph the p.d.f and show that the probability of the part failing in the first 200 weeks is 1/8
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