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The normally distributed AAA battery life is stated to be 350 days when used in a clock radio. The Big Charge Battery Company has recently modified the AAA batteries so as to extent their life. The owner of the company wanted to know if the improved batteries really did last significantly longer. A sample of 100 of the improved batteries was tested. It was discovered that the mean life was 362 days and the sample standard deviation was 10 days. The research department decided to conduct the test at the 0.05 level of significance whether the modification actually increased the life of the AAA battery. What was their decision rule?
A. Reject the null hypothesis if computed z is 1.96 or greater.B. Do not reject the null hypothesis if the z test statistics is 1.96 or greater.C. Do not reject the null hypothesis if computed z is 1.65 or greater.D. Reject the null hypothesis if computed z is less than 1.96.
At all times, the urn comprises N balls-some white balls and some black balls. At each stage, coin having probability p, 0
If researcher obtains sample mean of M = 88, which combination of factors is most likely to result in rejecting null hypothesis?
In this paragraph, be sure to make it clear how you handled the issue of conducting three planned comparisons. Also provide the ANOVA summary table for these results.
Based on information, compute the following: Percentage (or portion) of children who watch television less than 6.5 hours a week.
The box plots below show the real estate values of single values of single family homes in two neighboring cities, in thousands of dollars.
An airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to e-mail during their flight.
Determine the probability distribution for X defined as number of defective items drawn (Hint: You have to determine P(X=0), P(X=1) and P(X=2).
At the significance level 0.01 is there sufficient evidence to conclude that a difference exists in the mean time required for the elimination of the rash?
The airline must sell 150 seats to break even on this particular flight. On what percent of the flights does the airline make money?
Determine point estimate of population mean? By using 90% confidence, determine the margin of error?
A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?
Informed Consent would be used in qualitative and quantitative research for data collection, and how each may impact it from a qualitative and quantitative standpoint
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