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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
Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxietyl test (high scores mean more anxiety). The score are as follows.
Octavio scores 10 points above the clas mean on the midterm. How many points above the class mean do you predict that he will score on the final. (Hint: what is the predicted final-exam score for th
A particular telephone number is used to receive both voice calls and fax messages. Suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (Round yo
An electrical transmission tower is subjected to loads X and Y. The mean and standard deviation of X are 100 and 20. The mean and standard deviation of Y are 200 and 50. The correlation coefficient
A card is drawn at random from an ordinary deck of 52 playing cards. There are 4 suits: hearts, spades, diamonds and clubs. Denote these by the letters {H, S, D, C}. In each suit, there are 13 cards
A resort tracks the number of days eaach guest stays. They've discovered that this variable is normally distributed with a mean of 9 days and a standard deviation of 3. They would expect 10% of the
The probability for which a decision maker cannot choose between a certain amount and a lottery based on that probability is