Sta 2023 Question Paper
STA 2023 Test on sections 6.1, 6.2, 7.1-7.3, and 7.5
STA 2023 Test on sections 6.1, , and 6.2.
Classify the following random variable as to whether it is discrete or continuous.
1) The number of runs scored in a baseball game. A) continuous B) discrete Ans = B
2) The cost of a road map. A) continuous B) discrete Ans = B
Provide an appropriate response.
3) A random variable is A) generated by a random number table. B) the variable for which an algebraic equation is solved. C) a numerical measure of a probability experiment.. Ans = C D) a qualitative attribute of a population.
4) Given the table of probabilities for the random variable x, does this form a probability …show more content…
If a student guesses on each question what is the mean number of correct answers? Ans = 8
STA 2023 Test on Ch 7
11) Use the standard normal distribution to find P(–1.24 < Z < 1.32). Ans = 0.7991
12) Use the standard normal distribution to find P(Z > 1.05). Ans = 0.1469
13) If P(0 < Z < a) = 0.4452 find a Ans a = 1.6
14) Assume credit ratings are normally distributed with a mean of 200 and a standard deviation of 50. If a person is randomly selected find the probability that his credit rating is between 200 and 270. Ans = 0.4192
15) Use the continuity correction and describe the region of the normal curve that corresponds to the indicated binomial probability. The probability that the number of correct answers is between 15 and 27 inclusive is A) The area between 14.5 and 26.5 B) The area between 14.5 and 27.5 C) The area between 15.5 and 26.5 D) The area between 15.5 and 27.5 Ans = B
16) Suppose you buy 1 ticket for $1 out of a lottery of 1,000 tickets where the prize for the one winning ticket is to be $600. What is your expected value? Ans = –40
STA 2023 Test on sections 6.1, , and 6.2.
Classify the following random variable as to whether it is discrete or continuous.
1) The number of runs scored in a baseball game. A) continuous B) discrete Ans = B
2) The cost of a road map. A) continuous B) discrete Ans = B
Provide an appropriate response.
3) A random variable is A) generated by a random number table. B) the variable for which an algebraic equation is solved. C) a numerical measure of a probability experiment.. Ans = C D) a qualitative attribute of a population.
4) Given the table of probabilities for the random variable x, does this form a probability …show more content…
If a student guesses on each question what is the mean number of correct answers? Ans = 8
STA 2023 Test on Ch 7
11) Use the standard normal distribution to find P(–1.24 < Z < 1.32). Ans = 0.7991
12) Use the standard normal distribution to find P(Z > 1.05). Ans = 0.1469
13) If P(0 < Z < a) = 0.4452 find a Ans a = 1.6
14) Assume credit ratings are normally distributed with a mean of 200 and a standard deviation of 50. If a person is randomly selected find the probability that his credit rating is between 200 and 270. Ans = 0.4192
15) Use the continuity correction and describe the region of the normal curve that corresponds to the indicated binomial probability. The probability that the number of correct answers is between 15 and 27 inclusive is A) The area between 14.5 and 26.5 B) The area between 14.5 and 27.5 C) The area between 15.5 and 26.5 D) The area between 15.5 and 27.5 Ans = B
16) Suppose you buy 1 ticket for $1 out of a lottery of 1,000 tickets where the prize for the one winning ticket is to be $600. What is your expected value? Ans = –40