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The employee taken at random turns out to be male. Compute the probability that he earns more than $30,000 a year (to 4 decimals).
A teacher ask her class, "How many children are there in your family, including yourself?" The mean response is about 3 children. According to the 2000 census, families that have children average 1.
In a regression-based estimate of a demand function, the b coefficient for advertising equals 2.75 with a standard deviation of 1.25 units. What is the range within which there can be 99 percent con
The U.S. Chemical Safety and Hazard Investigation Board (CSB) is responsible for determining the root cause of industrial accidents. Since its creation in 1998, the CBS has identified 83 incidents t
A certain test is designed to measure the satisfaction of an individual with his/her relationship. Suppose that the scores on this test are approximately normally distributed with a mean of and a st
A package contains a 42 marbles of the same size but different colors; 18 are yellow, 12 are blue, 9 are green, and 3 are black. What is the probability of selecting a blue marble and then a green mar
For each of the variables described below, indicate whether it is a quantitative or a categorical (qualitative) variable. Also, indicate the level of measurement for the variable: nominal, ordinal,
A car's ventilation system has various controls. The fan control has four settings: off, low ,medium, high. The air stream can be set to come out at the floor, through the vents, or through the defr
A slot machine at a casino pays out an average of $0.90 with a standard deviation of $110 it cost a dollar a play. If gamblers play this machine 6,969,600 times a month, what is the probability that
Given that Americans of Mexican ancestry constitute 79.1% of the population of 181,535 and, over a period of 11 years, only 339 of the 870 people selected for grand jury duty were Americans of Mexic
A random sample of 36 employees shows a mean investment of $736. Construct a 99.8 percent confidence interval for the mean investment of all its employees.
If you have a quantitative figure (y-value), and you know the SD(x), SD(y), mean of x, and mean of y, how do you determine the value of the residual?
The average length of time between billing and payments is the sample comes to 18.9 days, with a sample standard deviation of 5.3 days. Prepare a 98% confidence interval for the mean period between
The Utah State Fisheries Department caught 1,000 fish in the Utah Lake, marked them, and returned them to the lake. A week later, it caught another 1,000 fish and found 200 of them marked. Estimate
The goal at U.S. airports handling international flights is to clear these flights within 45 minutes. Let's interpret this to mean that 95 percent of the flights are cleared in 45 minutes, so 5 perc
Compare the means for the skewed distribution again and note any changes. Describe the shape of the distribution of sample means for each distribution. Discuss how this applet increased your understan
The U.S. Chemical Safety and Hazard Investigation Board (CSB) is responsible for determining the root cause of industrial accidents.
The probabilities of snow in a given region during each month of the year are Jan(40%), Feb(30%), Mar(20%). Apr(10%), May-Dec (2.5%). If it snows, what is the probability that it is February?
Study of packets over campus network revealed that 40% of students are interested in engineering websites, 50% of students are interested in medical websites, and 30% of students are interested in e
The network is idle 40% of the time, meaning that neither base nor users have messages to send. Assuming that 20% of the time a user has messages to transmit and 50% of the time the base station has
Assuming that 5 users are competing for 50 voice channels, in how many ways the base station can assign channels such that each user has at least 4 voice channels available for data communication i
In a newspaper ad, a car deal lists 3 cars. If the numbers of inquiries he will get about these cars may be regarded as independent random variables having Poisson distributions with the parameters
Fifty five percents of adults say cashews are their favorite kind of nut. You randomly select 12 adults and ask each to name her or his favorite nut. Find the probability that the number who say cas
Decide whether the experiment is a binomial, Poisson, or neither based on the information given. Each week a man plays a game in which he has a 21% chance of winning. The random variable is the numb