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Assume that a class contains 20 students. If the probability of a student obtaining an "A" is 0.7, a "B" is 0.2 and a "C" is 0.1, answer the following:
(a) What is the probability that 2 students will obtain A's, 2 obtain B's, and 16 obtain C's?(b) What is this probability if we are given that at least two students receive C's?(c) If A has a grade value of 4, B has a grade value of 3 and C has a grade value of 1, what is the expected grade of the class? Which law of probability will you use to compute this?
Given a sequence of independent flips of such a coin, derive a simple expression for the probability that the next flip will be a head.
Perhaps you have a millionaire, someone making $30,000 and a lot of people spread out all over (and evenly) in between. How would this need to change for median to be a better measure?
Create a stem-and-leaf display of these data. Create a box plot of these data.
Do the sample data present sufficient evidence to reject the manufacture's claim? Test using a a=0.05. What is the p-value of the test.
if 30 claims are selected, find the probability that 15 will contain 0 errors, 8 will contain 1 error, 5 will contain two errors and 2 will contain 3 errors.
Answer the following questions using the null hypothesis as "the individual does not have the disease." a. What is the probability of Type I error? (Round your answer to 2 decimal places.) b. What is the probability of Type II error? (Round your answ..
Assuming the population variances from both offices are equal, is there evidence of a difference in the mean waiting time between the two offices? Use α = 0.05
Information on a packet of seeds claims that the germination rate is 92%, only 171 of 200 test seeds sprout. Is this evidence that the seeds have lost viability during a year in storage?
A half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process standard deviation of 4 ml.
A multiple regression analysis includes 25 data points and 4 independent variables results in SST = 200 and SSR = 150. the multiple standard error of estimate will be?
For each given pair of numbers find the quadraticequation with integral coefficients that has the numbers as its solutions.
What is the approximate probability that the mean score X of these students is 23 or higher? D) Which of your two normal probability calculations in (a) and (c) is more accurate? Why?
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