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Suppose that there are a total of 16 students in an elementary school class. The teacher assigns each of the students a report on a mainland country in either North America or South America (not inc
One out of 5000 individuals in a population carried a defective gene. A random sample of 1000 individuals is studied. This can be treated as either a binomal probability problem or a poisson problem
What is probability that neither Jane nor Janet gets and A? What is the condotional probability that jane gets and A given that Janet gets an A?
What do we mean when we say that a statistical result is significant? What is the difference between a statistically significant and a meaningful result? Why is statistical significance important?
What percentage of your points are within the 1, 2, or 3 Standard deviations from the mean? Calculate the standard deviation using Range Rule of Thumb.Compare to the usual results.
Find the mean and standard deviation for the normal distribution where 50% of the data falls between 73.25 and 86.75. Assume the data is symmetric about the mean.
What is the distribution for the difference between the two sample means? Specify the distribution, and give the numerical values of the mean and standard deviation. Justify the distribution chosen.
In a math class college there are 22 students. 17 of these students are forensic science majors and 5 are computer science major. The class professor randomly select five students to go to a mathema
A dry-cleaning shop claims that a new spot remover will remove more than 70% of the spots to which it is applied. To check the claim, the spot remover is applied to 16 randomly selected spots. If on
Conduct the experiment/study. Reach conclusions and state in English: Calculate the associated p-value.
An insurance company states that 90% of its claims are settled within 30 days. A consumer group selected a simple random sample of 200 of the company's claims and found that 164 of the claims were s
The length of conversations between supervisors and workers in a certain manufacturing industry is normally distributed with a mean of 4.0 minutes and a standard deviation of 0.8 minutes.
Name the scale of measurement that applies to each of the following situations:
The Acme Light Bulb Company claims that the lifetimes of its 100-Watt light bulbs follow a normal distribution with a mean of 325 hours and a standard deviation of 35 hours.
Can the value of the mean, median, or mode of a set of scores ever be negative? Explain.
Give the mean and standard deviation of the distribution in part a, and show how they are calculated. Calculate the probability that from 10 to 12 of the men (i.e. 10, 11, or 12 men) have high blood
A mail-order company business has six telephone lines. Let X denote the number of lines in use at a specified time. Suppose the pmf of X is as given in the accompanying table.
The pmf of the amount of memory X (GB) in a purchased flash drive is given as the following.
An individual who has automobile insurance from a certain company is randomly selected. Let Y be the number of moving violations for which the individual was cited during the last 3 years. The pmf o
Determine the value of c so that the following functions represent joint probability distributions of the random variables X, Y a:f(x,y) = cxy for x = 1,2,3; y=1,2,3 b) f(x,y) ' c|x-y|, for x=-2,0,2
Suppose small aircraft arrive at a certain airport according to a Poisson distribution with a rate of 4 per hour. Find the probability that there will be more than two arrivals in an hour.
In an integrative research review of an interventions effectiveness, which statement is true of an inclusion statement is true of an inclusion statment limiting studies to randomized experiments (as
Researchers can run t-tests on which type of variables?
In a two-group intervention study, what is the meaning of a t-test with p value of 0.03 result?
One prominent physician claims that 70% of those with lung cancer are chain smokers. If his assertion is correct, the probability that 3 out 5 of such patients are chain smokers is?