[2026年更新]合格できるWGU Applied-Probability-and-Statistics試験最新158問題 [Q26-Q46]

26、Empirical probability = ?

27、In a normal distribution, 95% of data lies within:

28、Null hypothesis for a new drug shows no effect. True statement?

29、A sample of 100 houses was surveyed in each of two states: Georgia and Kansas. Square footages of the houses are summarized by state in the following side-by-side box plots.

What is the interquartile range for house sizes in Georgia?

30、Correlation coefficient r = #0.9 indicates:

31、Probability of at least one six in 2 dice rolls = ?

32、Binomial expected value = ?

33、A cafe recorded the total ice cream sales and the average maximum temperature of the day. The scatterplot shows the recorded data. The regression equation y = 13x # 598 estimates the total ice cream sales, y, of a day and the average maximum temperature, x, on that day.

What does the slope represent in this context?

34、In a class of 30 students, 18 are enrolled in a math course, and 12 are enrolled in a science course. Among the students enrolled in the science course, 8 are also enrolled in the math course.
What is the probability that a student is enrolled in the math course given that they are enrolled in the science course?

35、A dataset: 4, 8, 12, 16, 20. Mean = ?

36、Z-score formula = ?

37、Probability cannot be:

38、95% confidence interval for mean = (45, 55). Which statement is correct?

39、There are 10 green, 20 yellow, and 15 purple marbles in a jar.
What is the probability of selecting 2 green marbles in a row and then 1 yellow marble, replacing the marble each time?

40、Histogram is best for:

41、Probability of rolling sum = 2 on 2 dice = ?

42、Standard deviation squared = ?

43、t-test used when:

44、Sum of probabilities in sample space = ?

45、Regression slope indicates:

46、Uniform distribution 0-10: P(X < 4) = ?