shadsiei
2021-05-21
Answered

One hundred adults and children were randomly selected and asked whether they spoke more than one language fluently. The data were recorded in a two-way table. Maria and Brennan each used the data to make the tables of joint relative frequencies shown below, but their results are slightly different. The difference is shaded. Can you tell by looking at the tables which of them made an error? Explain. Maria's table YesNo Children0.150.25 Adults0.10.6 Brennan’s table YesNo Children0.150.25 Adults0.10.5

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asked 2020-11-09

When working with bivariate data, which of these are useful when deciding whether it’s appropriate to use a linear model?

I. the scatterplot

II. the residuals plot

III. the correlation coefficient

A) I only

B) II only

C) III only

D) I and II only

E) I, II, and III

I. the scatterplot

II. the residuals plot

III. the correlation coefficient

A) I only

B) II only

C) III only

D) I and II only

E) I, II, and III

asked 2021-02-19

To find:The qualitative or quantitative and as univariate or bivariate.

asked 2022-04-19

J. P. Morgan Asset Management publishes information about financial investments. Between 2002 and 2011 the expected return for the S&P was with a standard deviation of and the expected return over that same period for a Core Bonds fund was with a standard deviation of (J. P. Morgan Asset Management, *Guide to the Markets*). The publication also reported that the correlation between the S&P and Core Bonds is . You are considering portfolio investments that are composed of an S&P index fund and a Core Bonds fund. **a. **Using the information provided, determine the covariance between the S&P and Core Bonds. Round your answer to two decimal places. If required enter negative values as negative numbers.

asked 2021-06-08

When a correlation value is reported in research journals, there often is not an accompanying scatterplot. Explain why reported correlation values should be supported with either a scatterplot or a description of the scatterplot.

asked 2021-05-05

Consider a random sample of size n = 31, with sample mean

asked 2021-06-19

Use a graphing calculator to construct a 95% confidence interval for a sample of size 30 from a uniform distribution over the interval (0, 1). Take a class poll to determine the percentage of confidence intervals that contain the true mean. Discuss the result in class.

asked 2021-06-03

Suppose you were to collect data for each pair of variables. You want to make a scatterplot. Which variable would you use as the explanatory variable and which as the response variable? Why? What would you expect to see in the scatterplot? Discuss the likely direction, form, and strength. Gasoline: number of miles you drove since filling up, gallons remaining in your tank