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The sales records for a real estate company are given. From the sample data, the following frequency distribution has been developed.
Sale Price (1000's) Number of Houses Sold (frequency)
20-39 1
40-59 2
60-79 4
80-99 2
100-119 1
Compute the mean, variance and standard deviation for the grouped data. Based on the previous answer, how much could the realtor expect to make if he sells 3 houses?
What is the probability that two of absent students were girls.What is the probability that two of absent students were boys.
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
At the .05 significance level, can we conclude that the guideline is still reasonable?
Use the method of least squares to model the relationship between x and y.
Make a stem plot for the men height data. Calculate the five-number summary for the women.
The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution
Describe each of the following methods of statistical inference in detail (Please try to use layman's terms).
Let X 1 , X 2 , X 3 , X 4 be a random sample from a Poisson distribution with parameter λ and let Y = X 1 + X 2 + X 3 + X 4 . You decide to test λ = 1.60 versus λ
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
Assuming that these are a random sample of all publicly traded companies, construct a 95% confidence interval for the overall noncompliance proportion.
If you had only one minute to estimate the standard deviation of a frequency distribution using only the information that can be obtained from a stem and leaf display, how would you do it and why?
We are asked to test for independence between age (i.e., adult and teen) and drink preferences.
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