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A botanist wishes to test the null hypothesis that the average diameter of the flowers of a particular plant is 9.6 cm. He decides to take a random sample of size n = 80 and accept the null hypothesis if the mean of the sample falls between 9.3 cm and 9.9 cm; if the mean of this sample falls outside this interval, he will reject the null hypothesis. What decision will he make and will it be in error if
(a) he gets a sample mean of 10.2 cm and μ = 9.6 cm;
(b) he gets a sample mean of 10.2 cm and μ = 9.8 cm;
(c) he gets a sample mean of 9.2 cm and μ = 9.6 cm;
(d) he gets a sample mean of 9.2 cm and μ = 9.8 cm?
a sample of n 4 difference scores produces ss 48. what is the estimated standard error for the sample mean
in a study to investigate the effect of the color paper blue green orange on response rates for questionnaires
Use the range to calculate the standard deviation
A linear regression model has a slope of â?"2.5 and an intercept of 10. The sample coefficient of determination is 0.50. What is the value of the sample correlation coefficient?
You are appraising the quality of diamonds for your importer. A diamond without a clear center (opaque center) shall be downgraded and sold at discount.
Use the t test to determine whether the slope of the regression model is significant at α = 0.05.
Reconsider Eddie's Bicycle Shop described in Prob. 22.4-7. Forty percent of the bicycles require only a minor repair. The repair time for these bicycles has a uniform distribution between 0 and 1 hour.
Use exponential smoothing to forcast Aug. income. Assume that the initial forecast for Feb. is $65,000. The smoothing constant selected is x=0.1
to test the significance of an individual regression coefficient we would conduct a and look for p-values smaller than
Find the probability that when 236 reservations are accepted for Flight 179, there are more passengers showing up than there are seats available.
the weekly demand for a product is believed to be normally distributed. compute the degrees of freedom. use ?0.10. the
1 based on historical data your manager believes that 33 of the companys orders come from first-time customers. a
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