At a particular airport, 81% of the flights arrived on time last year. If 15 flights are randomly selected, find the probability that 11 or fewer flights are on time. The correct answer and explanation is : To solve this problem, we are looking for the probability that 11 or fewer flights out of 15 […]

A silly psychology student gathers data on the shoe size of 30 of his classmates and their GPA’s. The correlation coefficient between these two variables is most likely to be A) exactly –1.0 B) near -0.6 C) near 0 D) near +0.6 E) exactly +1.0 The correct answer and explanation is : The correct answer

We can use the length of a man’s hand span to predict his height, with a correlation coefficient of r = 0.60. If we change our measurements from cm to m, the new correlation will be A) 0.006 B) 0.06 C) 0.60 D) 6 E) none of these The correct answer and explanation is :

If a data set has a relationship that is best described by a linear model, then the residual plot will A) also have a linear pattern with a similar correlation. B) have no pattern with a correlation near 0. C) have a curved pattern, like a parabola. D) be an unknown shape. E) none of

A regression model examining the amount of distance a long distance runner runs (in miles) to predict the amount of fluid the runner drinks (ounces) has a slope of 4.6. Which interpretation is appropriate? A) The correlation is needed to interpret this value. B) A runner drinks a minimum of 4.6 oz. C) We predict

Using the equation in number #8 again, if a homeowner doubles the number of lights he uses from 500 to 1000, how much do we predict he will increase his electric bill by? A) $2 B) $10 C) $12.50 D) $22.50 E) $35 The correct answer and explanation is : To determine how much a

Is the ionic compound AgBr soluble or insoluble, and does each of its ions tend to be soluble? a. Both ions soluble b. Both ions insoluble c. Ions differ; soluble d. Ions differ; insoluble The correct answer and explanation is : Correct Answer: d. Ions differ; insoluble Explanation: The compound AgBr (silver bromide) is classified

Is the ionic compound (NH4)3PO4 soluble or insoluble, and does each of its ions tend to be soluble? a. Both ions soluble b. Both ions insoluble c. Ions differ; soluble d. Ions differ; insoluble Correct Answer: a. Both ions soluble Explanation: The compound $(NH_4)_3PO_4$, known as ammonium phosphate, is composed of two types of ions:

Classify the solution properties of 1.0 M acetic acid. a. Strong electrolyte b. Weak electrolyte c. Non-electrolyte d. Pure liquid The correct answer and explanation is : Correct Answer: b. Weak electrolyte Explanation: A 1.0 M acetic acid (CH₃COOH) solution is classified as a weak electrolyte. To understand why, we need to consider what happens

The actual physical material that holds the data and programs. a. primary storageb. mediac. capacityd. access The Correct Answer and Explanation is: Correct Answer: b. media Explanation: The correct answer is media, which refers to the actual physical material used to store data and programs in a computer system. In computing, the term “media” (or