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A gemologist is interested in determining the relation that exists between the size of adiamond (carats) and the price. The following data represents the weight and price of diamonds.
Assume that we would like to calculate a 99% confidence interval for unknown mean range, µ, of bats using data in.
A paired-difference experiment dealing with the response latencies for noise detection under two conditions employed a sample of twelve 9-month-old children and reported sample mean difference of 70
Assume you're given data from the survey showing the IQ of each person interviewed and IQ of his or her mother. That is all the information you've. Your boss has asked you to put together the report
Of independent random sample of 1000 people in France, 790 had positive attitude towards car salesmen. Test at the 1% level the null hypothesis that population proportions are equal against the alte
Assume a device contains three ceramic insulators and all should survive the shock in order of device to work. Determine the maximum likelihood estimate of the probability that all three will surviv
Assume that we observe the random variable having the binomial distribution. Let X be the number of successes in n trials.
Assume that the mean on this test is 75.6 with the standard deviation of 7.8. Assume also that the scores follow a bell=shaped distribution.
A random sample of 19 rainbow trout caught at Brainard Lake, Colorado had mean length sample mean= 11.9 inches with standard deviation s=2.8 inches. Determine a 99% confidence interval for the popul
Suppose that the z scores are normally distributed with a mean of 0 and a standard deviation of 1.
The melting points of two alloys employed in formulating solder were investigated by melting 21 samples of each material. The sample mean and standard deviation for alloy 1 was X1= 420.48 and S1= 2.
Let U be the geometric random variable with p=.3, V be a geometric random variable with p=.2, X be a geometric random variable with p=.5, Y be a geometric random variable with p=.4. Let U, V, X, Y b
Let x, y, z be i.i.d. uniform random variables over the interval [0,20]. Let U=min(X,Y,Z) V=max(X,Y,Z). Find E(U), E(V), Var(U), Var(V), Cov(U,V) and correlation coefficient of U and V.
Assume the wieght of mints are normally distributed. Throughout the Friday night shift, 28 mints were chosen at random from production line. They had average weight of 21.45 grams and sample varian
Calculate the exponential smoothing forecasts for a = .3. Which exponential smoothing constant offers more accurate forecasts based upon MSE? Forecast week 11.
Do the sample data support claim that both alloys have same variance of melting point ? employ alpha = 0.05 in reaching your conclusion
Suppose the sample is representative of overall population. For a person chosen at radom, calculate the following probabilities:
In the following condition what is the statistic and the parameter it would estimate.
Determine a 90% confidence interval for average weight of all packages of ground beef in the meat case of Best Market.
Sales for boxes of Girl Scout cookies over 4-month period were forecasted as follows: 100, 120, 115, and 123. The actual results over 4-month period were as follows: 110, 114, 119, 115. What was the
To assess the accuracy of laboratory scale, we weigh standard weight (known to weigh 10 grams) repeatedly and calculate the mean. The scale readings are normally distributed with unknown mean (which
Provide a 90% confidence interval for the mean number of months students at this university date before becoming engaged.
If the incomes are normally distributed as well as two university-educated employees are randomly chosen, determine the probability that one of the them earns more than $66,000 for each year and th
Daily demand for newspapers for last 10 days has been as follows: 12, 13, 16, 15, 12, 18, 14, 12, 13, 15 (listed from oldest to most recent). Forecast sales for next day using two-day weighted movin