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It is decided to measure the resistance of sheets of a certain metal at temperatures X of 100K, 200K, 300K, 400K and 500K. The resistances Y are found to be 4.7, 7.4, 12.4, 16.5, and 19.8, respectively. If the regression of Y on X is assumed to be linear, state the normal equations for the parameters in the linear model, and solve.
Assume that a 95% confidence interval estimate of the population mean annual starting salary is required. What is the planning value for the population standard deviation?
A new car is designed to run a mean of at least 50 000 kilometers before its first tune-up. Tests with 30 cars show a sample mean of 49 500 kilometers and a sample standard deviation of 1000 kilometers.
in a recent study of 44 eighth graders the mean number of hours per week that they watched television was 19.5 with a
The population of car speeds is approximately normally distributed. Determine a 90% confidence interval estimate for the speed of all cars.
If the population meanis to be estimated to within two days, with 95% confidence, how many outside salespeople should be sample.
Kay Manning is a sales manager with two salespeople working for her. The ability of each salesperson to secure new accounts has historically been: Jesse Burkett can generate 4 new accounts per 10 visits to prospects
By definition, these are not consistent - e.g. the effect of temperature is different at the two photo-periods. What to do if an interaction is present?
What do we mean by confidence intervals - provide an example that illustrates your answer. Suppose we were to apply 95% and 99% confidence to your study results.. how might your result differ and why?
For commercial banks in each state, the U.S. Federal Deposit Insurance Corporation has determined the percentage of domestic assets held by multibank holding companies. Display the distribution as a less-than ogive.
a sampling of 240 students out of 1200 students were selected to study there average test scores. since the sample size
Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..
Evaluate the union's claim. Include the hypotheses (both null and alternate), alpha, test statistic (highlight where it is calculated on your spreadsheet), decision, conclusion.
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