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A flour mill produces flour in small bags before distributing them to wholesalers. The average weight of each bags is 8 kg with a standard deviation of 0.5 kg. A random sample of 50 bags was taken and found that the average weight is 7.8 kg. Using a significance level of 0.01, test the hypothesis that µ = 8 kg against the alternative µ<8 kg.
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
what percent of the total number of seeds germinated?
Would you play this game if you wanted to make money? What do we expert the value of the results of the game to be?
What is the total amount spent on consumer goods?
How would you go about studying a nonlinear or curvilinear relationship between two variables using contingency tables and chi-square tests? Provide examples from you own professional experience.
Note that under the exponential assumption, P(X>t) = exp(-t/theta). If t=5, use the result from (a) to find an approximate one-sided lower 95% confidence limit for theta.
A study group of long distance phone calls made from the corporate offices of Pepsi Bottling Group, Inc., in Somers, New York, revealed the length of the calls, in minutes, follows normal probability distribution.
Suppose that about 48% of all infants are girls. The maternity ward at a large hospital handles 1000 deliveries per year. A smaller hospital in the same city records about 50 deliveries per year. At which hospital is it more likely that between 46..
One advantage of the repeated measures ANOVA is that it eliminates "individual differences" as a source of variability. Explain why there are no individual differences in the numerator and in the denominator of the F ratio.
Construct a 90% confidence interval for the population proportion p . Does your result agree with your conclusion in part (a)?
what is the probability that the sample mean of IQ scores will not differ from the population mean by more than 2 points? (Round your answer to four decimal places.)
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