# Bivariate data questions and answers

Recent questions in Bivariate numerical data
THABISILE MOTA 2022-05-29

### If r is closer to zero x and y are unrelated

THABISILE MOTA 2022-05-29

2022-05-09

2022-05-09

### The average credit card debt for a recent year was $9205. Five years earlier the average credit carddebt was$6618. Assume sample sizes of 35 were used and the population standard deviations ofboth samples were $1928. Find the 95% confidence interval of the difference in means. 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. 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. Njifor Raymond 2022-03-18 ### the probability that a mash stick will break on been stroked is 0.4.what is the probability that out of 50 sticks striken a) non will breakb)more than one stick will break Charles Kingsley 2021-12-17 ### Give an example of each or state that the request is impossible. For any that are impossible, give a compelling argument for why that is the case. a) A sequence with an infinite number of ones that does not converge to one. b) A sequence with an infinite number of ones that converges to a limit not equal to one. c) A divergent sequence such that for every $n\in N$ it is possible to find nn consecutive ones somewhere in the sequence. aortiH 2021-06-29 ### For all these problems, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding. In order to use a normal distribution to compute confidence intervals for p, what conditions on pp and nq need to be satisfied? Elleanor Mckenzie 2021-06-23 ### The pathogen Phytophthora capsici causes bell pepper plants to wilt and die. A research project was designed to study the effect of soil water content and the spread of the disease in fields of bell peppers. It is thought that too much water helps spread the disease. The fields were divided into rows and quadrants. The soil water content (percent of water by volume of soil) was determined for each plot. An important first step in such a research project is to give a statistical description of the data. Soil Water Content for Bell Pepper Study 1591510amp;14amp;15amp;12amp;10amp;14amp;12amp;9amp;10amp;14amp;9amp;10amp;11amp;13amp;10amp;9amp;9amp;12amp;7amp;9amp;amp;11amp;14amp;16amp;amp;11amp;13amp;16amp;amp;11amp;14amp;12amp;amp;11amp;8amp;10amp;amp;10amp;9amp;11amp;amp;11amp;8amp;11amp;amp;13amp;11amp;12amp;amp;16amp;13amp;15amp;amp;10amp;13amp;6 (a) Make a box-and-whisker plot of the data. Find the interquartile range. illusiia 2021-06-23 ### You were asked about advantages of using box plots and dot plots to describe and compare distributions of scores. Do you think the advantages you found would exist not only for these data, but for numerical data in general? Explain. glasskerfu 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. jernplate8 2021-06-19 ### Construct 90% and 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals. In a survey of 2241 U.S. adults in a recent year, 650 made a New Year's resolution to eat healthier. bobbie71G 2021-06-16 ### The following advanced exercise use a generalized ratio test to determine convergence of some series that arise in particular applications, including the ratio and root test, are not powerful enough to determine their convergence. The test states that if$ $lim\left\{n\to \mathrm{\infty }\right\}\frac{a\left\{2n\right\}}{{a}_{n}}<\frac{1}{2}$ then $\sum {a}_{n}$ converges, while if $lim\left\{n\to \mathrm{\infty }\right\}\frac{a\left\{2n+1\right\}}{{a}_{n}}>\frac{1}{2}$ then $\sum {a}_{n}$ \$ diverges. Let ${a}_{n}=\frac{{n}^{\mathrm{ln}n}}{{\left(\mathrm{ln}n\right)}^{n}}$. Show that $\frac{{a}_{2n}}{{a}_{n}}\to 0$ as $n\to \mathrm{\infty }$

facas9 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.

emancipezN 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

CoormaBak9 2021-06-02

### The two-way table summarizes data from an experiment comparing the effectiveness of three different diets (A, B, and C) on weight loss. Researchers randomly assigned 300 volunteer subjects to the three diets. The response variable was whether each subject lost weight over a 1-year period. Suppose we randomly select one of the subjects from the experiment. Show that the events "Diet B" and "Lost weight" are independent.

banganX 2021-05-31