Experience indicates that 30% of the people entering a store make a purchase. From a random...
Experience indicates that 30% of the people entering a store make a purchase. From a random sample of 20 people who entered the store, use the Poisson distribution to compute the probability that exactly half of them bought something.
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6.31%
4.13%
50%
95.7%
13.01%
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Experience indicates that 30% of the people entering a store
make a purchase. From a random...
5. The number of people entering a store in a given hour is claimed to have...
5. The number of people entering a store in a given hour is claimed to have a Poisson distribution with a mean (lambda) of 5 a. What is the probability that exactly five people will enter the store in one hour? b. Less then five? c. More than five? d. How many people (N) must enter the store in one hour before you should be surprised? (The probability of this event is less than 5%.) Explain. Mention the difference between...
5. The number of people entering a store in a given hour is claimed to have...
5. The number of people entering a store in a given hour is claimed to have a Poisson distribution with a mean (lambda) of 5 a. What is the probability that exactly five people will enter the store in one hour? b. Less then five? c. More than five? d. How many people (N) must enter the store in one hour before you should be surprised? (The probability of this event is less than 5%.) Explain. Mention the difference between...
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2. For each of the following random variables: • Decide whether it would be appropriate to model it as a Bernoulli, binomial, geometric, or Poisson distribution, or none of the above. Explain briefly why these choices are appropriate, including any independence assumptions. If appropriate, give the parameter value(s). • Determine the expected value, variance, and standard deviation of the random variable. If it follows one of the special distributions, you can use the known formulas discussed in class. (If multiple...
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4.3.5 Refer to Exercise 4.3.4. Find the mean and variance of the number of people tested for HIV in samples of size 15. 4.3.6 Refer to Exercise 4.3.4. Suppose that we were to take a simple random sample of 25 adults today and find that two have been tested for HIV at some point in their life. Would these results be surprising? Why or why not? BINOMIAL TABLES 4.3.7 Coughlin et al. (A-6) estimated the percentage of women living in...
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1) Continuous random variables are obtained from data that can be measured rather than counted. A) True B) False 2) Discrete variables have values that can be measured. A) True B) False 3) Determine whether the random variable described is discrete or continuous. The number of minutes you must wait in line at the grocery store A) continuous B) discrete 4) Determine whether the random variable described is discrete or continuous. The total value of a set of coins A)...
1. The access code for a car's security system consists of four digits. be zero and...
1. The access code for a car's security system consists of four digits. be zero and the last digit must be even. How many different codes are consists of four digits. The first digit cannot many different codes are available? 2. Decide whether each object is a permutation or a combination a) a telephone number b) a social security number c) a hand of cards in poker d) a committee of politicians e) the "combination" on a student gym locker...
Statistic Q1(a) Mr. Sweetheart likes sugar in his hot tea. He buys sugar packets from a...
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5. The number of people entering a store in a given hour is claimed to have a Poisson distribution with a mean (lambda) of 5 a. What is the probability that exactly five people will enter the store in one hour? b. Less then five? c. More than five? d. How many people (N) must enter the store in one hour before you should be surprised? (The probability of this event is less than 5%.) Explain. Mention the difference between...
7. Suppose that 8% of all people that experience a heart attack will die during hospitalization. (a) Consider a random sample of 30 people who experienced a heart attack. What is the probability that exactly four of them will die during hospitalization? To answer this question, first define an appropriate random variable X. Identify the probability distribution of X including the parameter values. (b) Is the probability distribution you used in part (a) the true probability distribution of X? If...
1) Continuous random variables are obtained from data that can be measured rather than counted. A) True B) False 2) Discrete variables have values that can be measured. A) True B) False 3) Determine whether the random variable described is discrete or continuous. The number of minutes you must wait in line at the grocery store A) continuous B) discrete 4) Determine whether the random variable described is discrete or continuous. The total value of a set of coins A)...
1. The access code for a car's security system consists of four digits. be zero and the last digit must be even. How many different codes are consists of four digits. The first digit cannot many different codes are available? 2. Decide whether each object is a permutation or a combination a) a telephone number b) a social security number c) a hand of cards in poker d) a committee of politicians e) the "combination" on a student gym locker...
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