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It is claimed that a certain type of bipolar transistor has a mean value of current gain that is at least 210. A sample of these transistors is tested. If the sample mean value of current gain is 200 with a sample standard deviation of 35, would the claim be rejected at the 5 percent level of significance if
(a) the sample size is 25;
(b) the sample size is 64?
Develop a 95% confidence interval to estimate the difference in SAT math scores from students in Delaware and New jersey.
Given the following data, use exponential smoothing with a=0.2 and a=0.5 to generate forecasts for periods 2 through 6. Use MAD and MSE to decide which of the two models produced a better forecast.
the undergraduate grade point average gpa for students admitted to the top graduate business schools was 3.37. assume
Test whether the weight reducers on average will lose less than 10 pounds using P-value approach.
Let X equal the number of people selected at random that you must ask in order to find someone with the same birthday as yours. Give the values of the mean, variance, and standard deviation of X?
a telephone company claims that 90 percent of the time when customers call for directory assistance the customer is
mr. smith was admitted to the hospital for surgery on his left knee. when mr. smith woke up from the anesthesia he
Describe a hypothesis you have related to the area of psychology in which you are predicting a correlation. What is the specific nature (direction) of the correlation and why do you think it would occur?
Evidence that average family income in a community
Suppose you obtain a 100 bag random sample by taking 25 subgroups of 4 bags each, the mean weight of the 25 subgroups was 16.00 ounces with a total of the subgroup ranges of 87.5 oz.
You want to prove that a population mean is not 7. Data is ratio and a large sample size will be used (n = 225). When the sample is done the sample mean is computed to be 7.2 and the sample standard deviation is 1.5.
The instructor plans to draw a histogram of the 1,100 sample proportions. What will be the approximate mean for the 1,100 sample proportions?
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