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You aredoing a study examining the effects of studing methods on academic achievment. all the students in your study take a course on genetices that last for 10 for days. One group of students studie20 minutes a day for 1o days. the second group study once at the end of the coures but for 200 minutes. what is a onetial test?
Explain the value of test statistic using t distribution for the given value. Illustrate value of the t test statistic if you are testing a hypothesis.
Calculate the control limits for a c chart when Ubar = 3.0%, n = 60, and you collect one sample per hour for 40 hours of production. (2 sets of control limits required, x bar and range)
For a normal distribution, the probability of randomly selecting a z-score greater than z = -2.00 is p = .0228.
Given the following data from two independent samples, conduct a one-tailed hypothesis test to determine if the first sample mean is larger than the second sample mean, given a 0.05 level of significance.
A travel agent suggests that since the law of averages makes it highly unlikely to have two plane crashes within a few weeks of each other, flying soon after a crash is the safest time. What do you think?
Detremine the mean, standard deviation, and variance for this frequency distribution.
A sample mean is 102. another 50 observation with a standard deviation of 6 and a sample mean of 6. conduct a hypothesis using the .05 significance level.
Media Matrix and Jupiter Communications gathered data on the time adults and the time teens spend online during a month (USA Today, September 14, 2000).
The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
A researcher wanted to determine the mean number of hours per week (Sunday through Saturday) the typical person watches television. Results from the Sullivan Statistics Survey indicate that s=7.5 hours
For a population with µ = 62 and Ï? = 12, find the X-value that corresponds to each of the following z-scores.
Suppose that, in a sample of 200, we observe 140 successes. Is this sufficient evidence at the 1% significance level to indicate the the population proportion of successes is greater than 65%
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