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Assume that the population is normally distributed. Can we conclude, at the level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from months?
Assume the probability of a household owning a DVD player is 0.80. What is the probability that if 11 households are selected at random, exactly 9 of the households will own DVD players? Calculate t
Those methods involving the collection, presentation, and characterization of a set of data in order to properly describe the various features of that set of data are called
Suppose that in an box of 20 iPhones, there are 5 with defective touch screens. In a draw without replacement, if 3 iphones are picked at random, what is the probability that all 3 have defective sw
A new sample of 400 telephone numbers, at least 150 individuals will cooperate and respond to the questions? In other words, what is the probability that the sample proportion will be at least 150/4
in a population, 11% of the people are left handed. In a simple random sample of 160 people selected from this population, the proportion of left handers is 0.10. What is the number of left handers
Can you can tell the difference between coke and pepsi in a blind taste test? Most people say they can and have a preference for one brand or another. However, research suggests the people can corre
A business wants to estimate the true mean annual income of its customers. The business needs to be within $250 of the true mean. The business estimates the true population standard deviation is aro
Complete the opportunity loss table and compute the expected opportunity losses. Then, determine the optimal expected opportunity loss.
Cars arrive at a car wash randomly and independently; the probability of an arrival is the same for any two time intervals of equal length. The mean arrival rate is 15 cars per hour. What is the pro
Construct the decision tree diagram and perform backward induction analysis to determine the optimal course of action if a net change in profits is the expected payoff.
A campus program evenly enrolls (p = 0.5) undergraduate and graduate students. If a random sample of 4 students is selected from the program to be interviewed about the introduction of a new fast fo
In a random sample of 500 people aged 20-24, 22% were smokers. In a random sample of 450 people aged 25-29, 14% were smokers. Construct a 95% confidence interval for the difference between the popu
What is the probability that the sample of 16 pencil leads will have an average MIR between 6400 and 6550 psi? What assumptions did you make when answering the previous questions?
The percentage of physicians who are women is 27.9%. In a survey of physicians employed by a large university health system, 45 of 120 randomly selected physicians were women. is there sufficient ev
The heights of adults in one town have a mean of 66.3 inches and a standard deviation of 3.3 inches. What can you conclude from chebychev's theorem about the percentage of adults in the town whose
Thirty six of the staff of 80 teachers at a local school are certified in CPR. In 180 days of school, assuming that none of the teachers were ever absent, about how many days is it that the teacher
Given that the sample mean is x = 117.77 and the sample standard deviation is s = 11.50, determine how many sample standard deviations the score 151 is from the sample mean.
A 20-point midterm test results in grades which are normally distributed with a mean of 13 and standard deviation of 3. The professor would like 15% of the class to get A's, 30% to bet B's, 30% to g
a police department reports the probabilities that 0, 1, 2, and 3 burglaries will be reported in a given day are .5, .4, .09, and .01 find the mean of the probability distribution.
The standard deviation of the sample is 1. At a =.02 , is the number of sticks of gum a person chews per day actually greater than 8? Use the traditional method of hypothesis testing.
Compute the 95% confidence interval to estimate the true average sale for all shops. Why is an interval estimate better than a point estimate? What factors determine the width of a confidence interval
How if at all could you improve on your boss's formulation of the research question?
The sample average is $97, and the SD is $17. Assume that the repair cost has a normal curve.What is the null hypothesis?
Find the maximum total allowable weight if we want a 0.975 probability that this maximum will not be exceeded when 16 males are randomly selected.