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The Acme Candy Company claims that 60% of the jawbreakers it produces weigh more than .4 ounces. Suppose that 800 jawbreakers are selected at random from the production lines. Would it be unusual fo
The length of human pregnancies is approx. Normal with a mean of 266 says and a standard deviation of 16 days. What percent of all pregnancies lass between 234 and 298 days?
A multiple choice test has 15 questions, each having four possible answers of which only one is correct. If the questions are answered at random what is the probability of getting all of the right?
Consider choosing a five card poker hand from a standard deck of 52 playing cards. how many different hands are possible that can contain at least three hearts? order of cards is not important.
Given that the consumer uses a plastic card, there is a .19 probability that the consumer is 18 to 24 years old.
About 20% of the population is hopelessly romantic. If two people are randomly selected, what is the probability both are hopelessly romantic? What is the probability at least one is hopelessly roma
The Census Bureau provides data on the number of young adults, ages 18-24, who are living in their parents' home (the data include single young adults who are living in college dormitories because i
Completion times for reading test normally distributed mean of 62.7 minutes and Sttnadard deviation 6.3. Approximately what percent of the completion time is between 50.1 and 69 minutes
Let the joint distribution of X and Y be given in the table below:
Answer the general questions about target populations, sampling frame and units for their survey. Also do you think this survey provides valuable information for comparing health plans?
The August 1996 issue of Consumer Reports contained satisfaction ratings for various health maintenance organizations (HMO's) used by readers of the magazine. The ratings were based on more than 20,
If a researcher conducts a study on the percentage of students who do and do not read their social work textbook, what would be the sample size needed for the researcher to be 94.7% confident that 7
Assuming that the 50% rate (shown above) is correct, find the range of usual values for the numbers of graduates among 380 who stay at their first job less than two years.
What is a typical flow rate? What is a representative flow rate?
Compute the probability that the number of working machines at the beginning of the next three days is two, one, and two in that order.
The length of an injected-molded plastic case that holds tape is normally distributed with a mean length of 90.2 millimeters and a standard deviation of 0.10 millimeters.
Compute the frequency for each of the three classes. Compute the relative frequency for each of the three classes. Display the results, part a, in a frequency bar graph.
The photoresist thickness in semiconductor manufacturing has a mean of 10 micrometers and a standard deviation of 1 micrometer. Assume that the thickness is normally distributed and that the thickne
If the researcher used an independent-measures design, how many subjects participated in the experiment?
Use the defining formula, the computation formula, or a calculator to compute s. (Enter your answer to one decimal place.) Add 2 to each data value to get the new data set 17, 9, 19, 16, 17. Compute s
Find the probability that none of the households are tuned to Lindsay and Tobias.
The numbers of graduates among 380 who stay at their first job less than two years should usually fall between __ and __. (Use ascending order)
Among the digits 1,2,3,4 and 5, first one is chosen and then a second selection is made among the remaining four digits. Assume that all twenty possible results have equal probability. Find the prob
Assume that all twenty possible results have equal probability. Find the probability that an odd digit will be selected the first time, second time and both times.