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The waiting time for customers at MacBurger Restaurants follows a normal distribution with a population standard deviation of 1 minute. At the Warren Road MacBurger, the quality-assurance department sampled 50 customers and found that the mean waiting time was 2.75 minutes. At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
A candidate must gather at least 8,000 valid signatures on a petition before the deadline in order to run in an election. One candidate turns in 10,000 signatures right before the deadline
An error with the release valve has caused the setting on the mint release machine to "shift". Assume that the machine shift is filling the bags with a mean weight of 11.56 ounces and a standard deviation of 0.05 ounces
De?ne what is meant by a random variable, and give an example
the data below are sales y in thousands of dollars per week for home improvement outlets in each of four cities. the
exercise 6.28 provides data on sleep deprivation rates of californians and oregonians. the proportion of california
Perform exploratory data analysis on all variables in the data set. Realizing that you have six groups, be sure that your exploratory analysis is broken down by group. When possible, include appropriate graphs to help illustrate the dataset.
What is the distinction between distribution-free methods and nonparametric methods?
question the average heights of a random sample of 400 people from a city is 1.75 m. it is known that the heights of
What is the probability that a shopper will spend more than 25 minutes in a store? If 200 shoppers enter a store, how many shoppers would you expect to stay in the store for more than 25 minutes?
Calculate the mean, median, mode and standard deviation for the salaries rounded up to the nearest thousand of dollars
what is wrong with this statement? high linear correlation proves that the explanatory variable variable x caused the
a project was planned using pert with three times estimates. the expected completion time of the project was determined
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