What is the probability of getting at least 7 items accurate on a 10-item multiple choice test with four alternatives per item? Choices:0.005, О.007, О.009, 0.004, О.001
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What is the
Choices:0.005, О.007, О.009, 0.004, О.001
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- Four dice are rolled till the first six appears on one of them. What is the mean number of rolls required, inclusive the last one?A researcher asks random samples of residents of two separate counties as to whether they had purchased organically grown food in the last three months. He wants to determine whether the proportion of residents of one county who purchase organically grown food is greater than the proportion of residents of the second county who purchase organically grown food. Choose the appropriate test and name the population(s). a) Two-proportion z-test; one population is all adults who buy organically grown food and the other population is all adults who do not buy organically grown food. b) Two-proportion z-test; one population is all residents of the first county and the other population is residents of the second county. c) One-proportion z-test; the population is all residents of a state. d) One-proportion z-test; the population is all residents of the first county.A box contains 5 balls. Two are numbered 3, one is numbered 4, and two are numbered 5. The balls re mixed and one is selected random. After a ball is selected, its number is recorded. Then it replaced. If the experiment is repeated many times, find the mean of the numbers on the balls(round off uour final answer to decimal places
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- There are 38 activde telephone area codes in california. You want to choose an SRS of 10 of these area codes for a study of available telephone numbers. Label the codes 01 to 38 and use the simple random sample applet, table b or software to choose your sample.[partI_Item#1A]Hello. When doing the first calculation for the Test statistic i am getting a final answer of 44 not 63.36 using excel. Is there a reason for this?
- The drug Viagra became available in the U.S. in May 1988, in the wake of an advertising campaign that was unprecedented in scope and intensity. A Gallup poll found that by the end of the first week of May, 643 out of 1,005 adults were aware that Viagra was an impotency medication. a) What is the value of p̂? 1.56 0.36 0.6 0.64 b)What is the value of the standard error of p̂ for a confidence interval? 0.64 0.6 0.015 1.56There is a hotel that is opening where guests can rent a single room or double room. 70% of the guests prefer to rent a single room, while the rest prefer to rent a double room. There were 15 guests who were going to stay in the hotel one day. i) What is the mean and the standard deviation of the number of people who prefer to rent a single room? ii) What is the probability that the number of people who want a single room is more than two standard deviations away from the mean ? iii) There are only 13 single rooms and 10 double rooms at the hotel. If the 15 people get checked-in one after another, what is the probability that all of them will be able to rent their preferred kind of room?A committee with 3 members is to be chosen randomly from 5 boys and 7 girls and count the number of girls on the committee. a) Identify the two groups. b) In words, describe the random variable X. c) List the values of the random variable X takes on. d) What is the expected number of girls on the committee? e) Determine the standard deviation of the number of girls in the committee.
