BSTAT 2305 test 2 well answered already
passed 2025 updated
Assume the sample space S = {win, loss}. Select the choice that fulfills the requirements of the
definition of probability. - correct answer ✔✔P({win}) = 0.4 P({loss}) = 0.6
Given an experiment in which a fair coin is tossed three times, the sample space is S = {HHH,
HHT, HTH, THH, HTT, THT, TTH, TTT}. Event A is defined as tossing one head (H). What is the
event Ac and what is the probability of this event? - correct answer ✔✔Ac = {TTT, HHT, HTH,
THH, HHH}; P(Ac) = 0.625
Alison has all her money invested in two mutual funds, A and B. She knows that there is a 40%
chance that fund A will rise in price, and a 60% chance that fund B will rise in price given that
fund A rises in price. What is the probability that both fund A and fund B will rise in price? -
correct answer ✔✔0.24
Two hundred people were asked if they had read a book in the last month. The accompanying
contingency table, cross-classified by age, is produced.
under 30 30+
yes 76 65
no 24 35
The probability that a respondent is at least 30 years old is the closest to ______. - correct
answer ✔✔0.33
The standard normal distribution is a normal distribution with a mean equal to zero and a
standard deviation equal to ten. - correct answer ✔✔True
, It is known that the length of a certain product X is normally distributed with μ = 20 inches. How
is the probability P(X > 16) related to P(X < 16)? - correct answer ✔✔P(X > 16) is greater than
P(X < 16).
Find the probability P(−1.90 ≤ Z ≤ 1.90). - correct answer ✔✔0.9426
Find the z value such that P(Z ≤ z) = 0.9066. - correct answer ✔✔z = 1.32
The probability P(Z < 1.28) is closest to ______. - correct answer ✔✔0.90
The standard normal distribution is a normal distribution with a mean equal to zero and a
standard deviation equal to one. - correct answer ✔✔True
It is known that the length of a certain product X is normally distributed with μ = 15 inches. How
is the probability P(X > 16) related to P(X < 16)? - correct answer ✔✔P(X > 16) is smaller than
P(X < 16).
The probability P(Z =1.28) is closest to ______. - correct answer ✔✔0.00
Find the probability P(−1.80 ≤ Z ≤ 1.80). - correct answer ✔✔0.9282
Find the z value such that P(Z ≤ z) = 0.9099. - correct answer ✔✔z = 1.34
Statistics are used to estimate population parameters, particularly when it is impossible or too
expensive to poll an entire population. A particular value of a statistic is referred to as a(n) -
correct answer ✔✔estimate
passed 2025 updated
Assume the sample space S = {win, loss}. Select the choice that fulfills the requirements of the
definition of probability. - correct answer ✔✔P({win}) = 0.4 P({loss}) = 0.6
Given an experiment in which a fair coin is tossed three times, the sample space is S = {HHH,
HHT, HTH, THH, HTT, THT, TTH, TTT}. Event A is defined as tossing one head (H). What is the
event Ac and what is the probability of this event? - correct answer ✔✔Ac = {TTT, HHT, HTH,
THH, HHH}; P(Ac) = 0.625
Alison has all her money invested in two mutual funds, A and B. She knows that there is a 40%
chance that fund A will rise in price, and a 60% chance that fund B will rise in price given that
fund A rises in price. What is the probability that both fund A and fund B will rise in price? -
correct answer ✔✔0.24
Two hundred people were asked if they had read a book in the last month. The accompanying
contingency table, cross-classified by age, is produced.
under 30 30+
yes 76 65
no 24 35
The probability that a respondent is at least 30 years old is the closest to ______. - correct
answer ✔✔0.33
The standard normal distribution is a normal distribution with a mean equal to zero and a
standard deviation equal to ten. - correct answer ✔✔True
, It is known that the length of a certain product X is normally distributed with μ = 20 inches. How
is the probability P(X > 16) related to P(X < 16)? - correct answer ✔✔P(X > 16) is greater than
P(X < 16).
Find the probability P(−1.90 ≤ Z ≤ 1.90). - correct answer ✔✔0.9426
Find the z value such that P(Z ≤ z) = 0.9066. - correct answer ✔✔z = 1.32
The probability P(Z < 1.28) is closest to ______. - correct answer ✔✔0.90
The standard normal distribution is a normal distribution with a mean equal to zero and a
standard deviation equal to one. - correct answer ✔✔True
It is known that the length of a certain product X is normally distributed with μ = 15 inches. How
is the probability P(X > 16) related to P(X < 16)? - correct answer ✔✔P(X > 16) is smaller than
P(X < 16).
The probability P(Z =1.28) is closest to ______. - correct answer ✔✔0.00
Find the probability P(−1.80 ≤ Z ≤ 1.80). - correct answer ✔✔0.9282
Find the z value such that P(Z ≤ z) = 0.9099. - correct answer ✔✔z = 1.34
Statistics are used to estimate population parameters, particularly when it is impossible or too
expensive to poll an entire population. A particular value of a statistic is referred to as a(n) -
correct answer ✔✔estimate
