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1. Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
2. Your manager, who just read an abridged version of a statistics book, wants you to test hypotheses for the difference in two population means. The sample sizes for each are 23. He is adamant that you perform a z-test. What would you tell him? What specific explanation would you give?
Test the hypothesis that the average hourly wage for City A is more than $0.50 per hour above the average hourly wage in City B using the following sample data:
question a black and red die are thrown and let x be a random variable denoting the sum of the dice.a. find all sample
a poker player is dealt a five-card hand.a what is the probability that he or she has four of a kind in this hand?b
the u.s. census bureau collects and analyzes data on numerous aspects of american life by state including the
please show all work to achieve the answer. i already have the answer.the mean value of land and buildings per acre
you are going to select 6 players for a volleyball team from a group of 13 players. how many possible teams can be
A researcher obtains a Pearson correlation of r = 0.60 for a sample of n = 6 pairs of X and Y scores. If the researcher tests the significance of the correlation, what value will be obtained for the t statistic?
When sampling is from a population with standard deviation C = 55, using a sample of size n = 150, what is the probability that X will be at least 8 units away from the population mean µ,?
On the first exam your score was a 73%, on the second it was an 73%. The first exam counts for 20% of your grade and the second exam counts for 28% of your grade. What is your grade in the class so far?
consider a class in which there are 40 students enrolled. in what follows ignore february 29thjohn is a student in this
Problems on Sampling Variability and Standard Error and Confidence Intervals
The Pew Research Center’s Social & Demographic Trends project found that 46% of U.S. adults would rather live in a different type of community than the one where they are living now (Pew Research Center, January 29, 2009). The national survey of 2260..
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