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Alan, while snooping around his grandmother's basement stumbled upon a shiny object protruding from under a stack of boxes . When he reached for the object a genie miraculously materialized and stat
Below are data showing the results of six subjects on a memory test. The three scores per subject are their scores on three trials (a, b, and c) of a memory task. Are the subjects getting better eac
During the 3pm to 5pm time period, cars arrive at a banks drive through window at an average rate of 15 customers per hour. Asuume that the time between arrivals follows the expotentional distributi
Johns commute time to work during the week follows the normal probability distribution with a mean time of 26.7 minutesand a standard deviation of 5.1 minutes. What is the probability that the commu
Reasearchers for a manufacture of barometers reach each of 50 barameters at the same time each day. The mean of the readings is 30.4 (inches of mercury) with a standard deviation of 0.28 inch, and a
Create a game of chance using a coin, dice, or a standard deck of cards. Choose how to play the game and determine at least two ways to win. Then determine the probability of winning the game. Then
What percentage of the population has an IQ more 120? If the percentage of people who have IQ more than x is 85%. Find the value of x.
Assume that IQ scores are normally distributed, with a standard deviation of 18 points and a mean of 100 points. If 95 people are chosen at random, what is the probability that the sample mean of IQ
A factory makes light bulbs. Over a long period, 4% of them are found to be faulty. A random sample of 100 light bulbs is tested. Write down the expected number of faulty bulbs in the sample.
In the United States, a full-time employee works an average of 40 hours a week with a standard deviation of 2.5 hours per week. What percentage of employees work less than 35 hours a week?
A box contains four tickets, labeled 0,1,3,6. The chance that the sample sum of the labels on the tickets in three independent random draws with replacement from this box equals 8 is ________
The process of selecting and replacing is carried out 400 times. What is the expected number of black discs that would be drawn?
In the United States, a full-time employee works an average of 40 hours a week with a standard deviation of 2.5 hours per week. What percentage of employees work more than 43 hours a week?
A new muscle relaxant is available. Researchers from the firm developing the relaxant have done studies that indicate that the time lapse between administration of the drug and beginning effects of
The probability distribution of the discrete random variable X is given by the following table.
Joe Coach was curious to know if the average number of games won in a year predicts Super Bowl performance (win or lose). The x variable was the average number of games won during the past 10 season
A survey organization wants to take an SRS in order to estimate the proportion of pople who have seen a certain television program.
Suppose that for a given computer salesperson, the probability distribution of x = the number of systems sold in one month is given by the following table.
The proportions in the following table are based on a survey of a large number of adult men and women in the United States. Assume that these proportions are representative of adults in the United S
A company purchases shipments of machine components and uses this acceptance sampling plan. Randomly select and test 20 components and accept the whole batch if there are fewer than 3 defectives.
In order to set rates, an insurance company is trying to estimate the number of sick days that full time workers at an auto repair shop take per year.
According to a 2003 National Household Survey on Drug Use and Health, 263 out of 1,546 randomly selected Americans between the ages of 18 and 25 admitted to smoking marijuana during the last month.
With the four predictor variables (level of education, general physical health, and the two new ones that you name), draw out what the model of the regression equation would look like.
A gambler plays roulette, and makes a $1 bet on four numbers, 400 times. The bet pays 8 to 1. Find the chance that the casino will win between $30 and $40.
Determine the p-value in each case and decide whether, at the 5% significance level, the data provide sufficient eveidence to reject the null hypothesis in favor of the alternative hypothesis.