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A box contains 4 bolts. Two of them, labeled #1 and #2, are 5 mm in diameter, and two of them, labeled #3 and #4, are 7 mm in diameter. Bolts are randomly selected until a 5 mm bolt is obtained. The outcomes are the sequences of bolts that can be selected. So one outcome is 1, and the other is 342.
a.)list the equally likely outcomes.b.)what is the probability that both sides are 7mm?c.)what is the probability that one bolt is 5mm and the other is 7mm?
If there are 75 students in the class, what is the probability the professor needs more than 6 hours to mark all of the midterms?
Assume that the number of Telephone calls arriving in an office during a 15minute period has a Poisson distribution with mean number of calls equal 5.
200 people were surveyed and asked to rate mayor Michael Bloombergs effectiveness towards education. The rate scale is 1 (lowest) to 10 (highest). Mayor Bloomberg's average rating was 7.50, with a standard deviation of 2
Let's suppose that we have 2 variables year and age.. I use STATA to make them into dummy variables as follows:
Can we conclude that there is a positive association between the size of the home and the selling price? Use the .05 significance level.
An article in Baltimore Sun claimed that the typical supermarket trip takes a mean of 22 minutes. Suppose that in an effort to test this claim, you select a sample of 50 shoppers at a Baltimore City Giant.
The linear correlation coefficient, r, measures the strength of the linear relationship the variables in a set of ordered pairs (x,y). What is the maximum and minimum values for r?
Given that the student selected is a social science major, what is the probability that she is also a sophomore? Write your responses as fractions.
Suppose the people have weights that are normally distributed with a mean of 164lb and a standard deviation of 30lb. Find the probability?
Mention the critical value of test statistic (Or give the p-value of the test.)
Assume that x has a normal distribution, with the specified mean and standard deviation. Find the indicated probabilities.
In a test of the independence of two variables, one of the variables has two possible categories and the other has three possible categories.
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