Exam 26: Statistics and Data Analysis

A local politician was interested in determining whether income level affects opinion regarding the government's bailout bill for easing the 2008 financial crisis on Wall Street.He surveyed a sample of his constituents and got the following results.The correct null hypothesis to be tested is ________________________ . Opinion

Placebos are a tool for ________________________ .

What scale of measurement is the type of a car (sedan, SUV, convertible, etc)?

The model Can be used to predict the breaking strength (pounds) of a rope from its diameter (inches).According to this model, how much force should a rope one-half inch in diameter withstand?

Based on the partial ANOVA results shown below, the F statistic value is ________________________ .

Speeds of cars were measured as they passed one point on a road to study whether traffic speed controls were needed.Here's a histogram and boxplot of the measured speeds.Accurate statements about this distribution include.

A magazine that publishes product reviews conducted a survey of teenagers' preferences for cell phones.Three brands of cell phone designed specifically with teens in mind were the focus of the study.The table summarizes responses by brand and gender.What percent of female teenagers preferred the Sidekick LX?

A researcher is conducting a study on Internet use.He decides to first categorize the population by education level (high school, college graduate, advanced degree, etc.) and then survey a select number from each category.This sampling strategy is called ________________________ .

According to the following regression analysis, the correlation between average annual cash bonus and average annual pay using α = 0.05 is ________________________ .

Prices per share of the 20 most actively traded stocks on the New York Stock Exchange in October, 2012.Summary statistics for these data are shown below.The IQR for this set of dataset is ________________________ .

Based on the following plot of residuals, what can you say about the conditions for ANOVA?

If we were interested in using regression methods to predict the tourism revenue for a particular country that had 30 million foreign visitors we should ________________________ .

In a clinical trial, 780 participants suffering from high blood pressure were randomly assigned to one of three groups.Over a one-month period, the first group received a low dosage of an experimental drug, the second group received a high dosage of the drug, and the third group received a placebo.The diastolic blood pressure of each participant was measured at the beginning and at the end of the period and the change in blood pressure was recorded.Identify the response variable measured.

The nonparametric alternative to the paired t-test is the _______________________ .

Boxplots of earnings per share (EPS) data for a sample of retail company stocks and a sample of energy company stocks are shown below.Which of the following statement is true about the distributions of EPS for retail and energy stocks?

Use a single exponential smoothing (SES) model with α = .8 to forecast for January 2008 for the following data.Assuming that the forecast for December 2007 was 1.18 %, this value is ________________________ .

The effectiveness of three brands of stain remover (EZ-Clean, SpotX, and OXYBoost) were rated (A = excellent to F = poor) by different groups of consumers.The calculated value of the statistic for the appropriate nonparametric test is ________________________ .

Suppose that over the last 20 weeks, a law firm had a total of 1045 consultation calls, and that 126 of them did not get an appointment for an initial consult within 24 hours.The lower and upper control limits on the appropriate control chart for these data are ________________________ .

It was discovered that a larger proportion of children who slept with nightlights later developed nearsightedness, compared to children who did not sleep with nightlights.The headlines read, "Leaving a light on for you children causes nearsightedness!" Later it was pointed out that nearsighted people have more trouble seeing in the dark and are more likely to leave lights on at night for their kids.And those same nearsighted parents are likely to have nearsighted kids.This is an example of ________________________ .

Assume that a set of test scores in an Introduction to Finance class is normally distributed with a mean of 72 and a standard deviation of 8.Use the 68-95-99.7 rule to find the percentage of scores between 64 and 88.