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Perguntas do quiz (15)
1Which of the following statements is true?
- AThe bigger the margin of error, the smaller the confidence interval
- BThe center of a confidence interval is a population parameter
- CThe confidence interval is a type of point estimate
- DThe center of a confidence interval is a sample statistic
- EA population mean is an example of point estimate
2A random variable is said to be discrete if
- Ait can assume any real number within an interval
- Bthe rules of probability apply
- Cits possible values can be counted or listed
- Dit can be represented graphically
- Eit can assume any real number
3Suppose that X is a random variable that can assume the values 1, 2, and 3. If P(X = 1) = 0.1 and P(X = 2) = 0.2, what is P(X = 3)?
- A0.8
- B0.6
- C0.7
- D0.1
- E0.4
4Let the random variable X represent the profit made on a randomly selected day by a certain store. Assume that X is approximately normal with mean $360 and standard deviation $50. What is P(X >$400)?
- A0.2119
- B0.2881
- C0.7881
- D0.8450
5Delta Airlines quotes a flight time of 125 minutes for its flights from Cincinnati to Tampa. Suppose we believe that actual flight times are uniformly distributed between 120 minutes and 140 minutes. What is the probability that the flight will be more than 10 minutes late?
- A0.00135
- B0.00267
- C0.00543
- D0.00065
6Delta Airlines quotes a flight time of 125 minutes for its flights from Cincinnati to Tampa. Suppose we believe that actual flight times are uniformly distributed between 120 minutes and 140 minutes. What is the expected flight time?
- A110 minutes.
- B100 minutes.
- C130 minutes.
- D120 minutes.
- E140 minutes.
7The random variable x is known to be uniformly distributed between 1.0 and 1.5. Compute P(x = 1.25)
- A1/4
- B0
- C3/5
- D1/2
8The random variable x is known to be uniformly distributed between 1.0 and 1.5. Compute P(1.0 ≤ x ≤ 1.25)
- A3/5
- B0
- C1/2
- D1/4
9The random variable x is known to be uniformly distributed between 1.0 and 1.5. Compute P(1.2 ≤ x ≤ 1.5)
- A0
- B1/2
- C1/4
- D3/5
10The driving distance for the top 100 golfers on a tour is between 284.7 and 310.6 yards. Assume that the driving distance for these golfers is uniformly distributed over this interval. What is the probability the driving distance for one of these golfers is less than 290 yards?
- A0.4093 or 79.5%
- B0.5792 or 57.9%
- C0.2046 or 79.5%
11The driving distance for the top 100 golfers on a tour is between 284.7 and 310.6 yards. Assume that the driving distance for these golfers is uniformly distributed over this interval. What is the probability the driving distance for one of these golfers is at least 300 yards?
- A0.2046 or 79.5%
- B0.4093 or 79.5%
- C0.5792 or 57.9%
12The driving distance for the top 100 golfers on a tour is between 284.7 and 310.6 yards. Assume that the driving distance for these golfers is uniformly distributed over this interval. What is the probability the driving distance for one of these golfers is between 290 and 305 yards?
- A0.4093 or 79.5%
- B0.2046 or 79.5%
- C0.5792 or 57.9%
13Which one of these examples is a continuous random variable?
- AThe number of new accounts established by a salesperson in a year
- BThe number of correct guesses on a multiple choice test
- CThe number of women taller than 68 inches in a random sample of 5 women
- DThe number of children a randomly selected person has
- EThe time it takes a randomly selected student to complete an exam
14The probability is p = 0.80 that a patient with a certain disease will be successfully treated with a new medical treatment. Suppose that the treatment is used on 40 patients. What is the expected value of the number of patients who are successfully treated?
- A40
- B20
- C8
- D32
15During the period of time that a local university takes phone-in registrations, calls come in at the rate of one every two minutes. What is the expected number of calls in one hour?
- A22 calls/hour
- B30 calls/hour
- C33 calls/hour
Informações
- Descrição
- Quiz sobre Sem título, criado por Moldir Aimanova em 19-12-2017.
- Autor
- Moldir Aimanova
- Idioma
- English
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