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Technical support receives 60 calls a day for software related issues, 40 calls a day for hardware related issues, and 25 calls for other issues. What is the proportion of hardware related issues a day?
Construct a 95% confidence interval for the mean number of calories per bite for similar desserts.
the average selling price of blackberry smart phones purchased by a random sample of 35 customers in 2010 was 311.
The pancake house offers hash browns with up to five different toppings: cheese, ham , bacon, onions and mushrooms.
Assume that z is the test statistic. (Give your answers correct to two decimal places.)
Regression results for customers' preference ratings are given below. Notice that the results only show the a partial regression table
Public Health and Nutrition One measure of general health is your body mass index (BMI). Adults with a BMI between 18.5 and 24.9 are generally considered.
Louis Reasoner plans to reorder the cond clauses in eval so that the clause for procedure applications appears before the clause for assignments. He argues that this will make the interpreter more efficient:
Explain the terms: simple random sampling , systematic sampling, stratified sampling, cluster sampling and what is a time series? Explain the 4 main components of a time series.
Increasing the sample size of an opinion poll will reduce the (a) bias of the estimates made from the data collected in the poll.
You then sort by random numbers in ascending order. Finally, you take the first 50 sorted employees as your sample. Does this approach constitute a statistical or a nonstatistical sample?
A criminologist is interested in the effects of unemployment and policing on murder and has run the following multiple regression:
A random sample of n = 4 scores is obtained from a normal population with = 20 and = 4. What is the probability of obtaining a mean greater than M = 22 for this sample?
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