# Quantitative data questions and answers

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Summarizing quantitative data

### Refer to the Journal of Applied Psychology (Jan. 2011) study of the determinants of task performance. In addition to x1 = conscientiousness score and x2 = {1 if highly complex job, 0 if not}, the researchers also used x3 = emotional stability score, x4 = organizational citizenship behavior score, and x5 = counterproductive work behavior score to model y = task performance score. One of their concerns is the level of multicollinearity in the data. A matrix of correlations for all possible pairs of independent variables follows. Based on this information, do you detect a moderate or high level of multicollinearity? If so, what are your recommendations? x1 x2 x3 x4 Conscientiousness (x1) Job Complexity (x2).13 Emotional Stability (x3).62.14 Organizational Citizenship (x4).24.03.24 Counterproductive Work (x5)-.23-.23-.02-.62

Summarizing quantitative data

### An investor plans to put $50,000 in one of four investments. The return on each investment depends on whether next year’s economy is strong or weak. The following table summarizes the possible payoffs, in dollars, for the four investments. $$\begin{array}{|c|c|} \hline &Strong&Weak\\ \hline Certificate\ of\ deposit&6,000&6,000\\ \hline ​Office\ complex&15,000&5,000\\ \hline Land\ speculation&33,000&-17,000\\ \hline Technical\ school&5,500&10,000\\ \hline \end{array}$$ Let V, W, X, and Y denote the payoffs for the certificate of deposit, office complex, land speculation, and technical school, respectively. Then V, W, X, and Y are random variables. Assume that next year’s economy has a 40% chance of being strong and a 60% chance of being weak. a. Find the probability distribution of each random variable V, W, X, and Y. b. Determine the expected value of each random variable. c. Which investment has the best expected payoff? the worst? d. Which investment would you select? Explain. ### Use the summation formulas to rewrite the expression without the summation notation. Use the result to find the sums for n= 10, 100, 1000, and 10,000. $$\displaystyle{\sum_{{{i}={1}}}^{{n}}}{\frac{{{2}{i}+{1}}}{{{n}^{{2}}}}}$$ Summarizing quantitative data ANSWERED asked 2021-06-05 ### For each pair of variables, indicate whether a two-way table would be appropriate for summarizing the relationship. In each case, briefly explain why or why not. Satisfaction with quality of local K through 12 schools (satisfied or not satisfied) and political party (Republican, Democrat, etc.). Height (centimeters) and foot length (centimeters). Summarizing quantitative data ANSWERED asked 2021-05-21 ### Use the summation formulas to rewrite the expression without the summation notation. Use the result to find the sums for n= 10, 100, 1000, and 10,000. $$\sum_{i=1}^n \frac{2i+1}{n^2}$$ Summarizing quantitative data ANSWERED asked 2021-05-11 ### Car Repaors An automobile lealesrship has found that for every 140 cars sold, 23 will be brought back to the dealer for major repairs. If the dealership sells 980 cars this year, approximately how many cars will be brought back for major repairs? Summarizing quantitative data ANSWERED asked 2021-03-12 ### Describe the summary of the perfomance of eight graders nationwide. Summarizing quantitative data ANSWERED asked 2021-03-09 ### To Explain:the expected the mean, median,standard deviation and IQR to change. Summarizing quantitative data ANSWERED asked 2021-03-08 ### Explain the effect of correcting the error has on the IQR and the standard deviation. The professor calculated the IQR and the standard deviation of the test scores in question 6 before realizing her mistake that is she entered the top score as 46 but it was actually 56. Summarizing quantitative data ANSWERED asked 2021-03-02 ### Find the proportion of professional male golfers-drive on an average of 280 yards or less. Approximately 5 percent of professional male golfers are found to be less than an average of 280 yards. Summarizing quantitative data ANSWERED asked 2021-02-25 ### Given that there are 32 eight-bit strings that begin 101 and 16 eight-bit strings that begin 1101, how many eight-bit strings begin either 101 or 1101? Summarizing quantitative data ANSWERED asked 2021-02-25 ### Explain which measure of center best describes a typical wage at this company:the mean or the median. Summarizing quantitative data ANSWERED asked 2021-02-20 ### What variable measures the association between two Quantitative variables (positive/negative and Strength of the relationship between them? Summarizing quantitative data ANSWERED asked 2021-02-19 ### You deposit money into a saving account that earns interest. The balance Bo f the account after t years is given by $$\displaystyle{B}={1200}\cdot{1.05}^{{t}}{d}{o}{l}{l}{a}{r}{s}.$$ a. Make a table that shows the account balance for years 0 through 10. b. You want to buy a home entertainment center that costs$1500. How long will you need to wait to have enough money in your savings account? Report your answer to the nearest whole year.

Summarizing quantitative data

### Solve this question $$\displaystyle\frac{{{1}-{i}}}{{{2}+{4}{i}}}$$

Summarizing quantitative data

### The manager at Publix recently received information that customer satisfaction dropped at noon due to overcrowding in the checkout aisle. As a result, the manager went to the main floor to record the number of customers waiting in aisles 1-10 at noon. Which of the following choices would be an accurate description of the way the "number of customers" is used in this data set? a. individuals for the data set b. continuous qualitative variable for this data set c. discrete qualitative variable for this data set d. qualitative variable for this set e. continuous quantitative variable for this data set f. discrete quantitative variable for this data set

Summarizing quantitative data

### Birth Weights Are the birth weights described quantitative data or categorical data?

Summarizing quantitative data

### (a)To find:the better job of summarizing the growth rates. (b)To find:the measures in (d) the better job of summarizing the growth rates.

Summarizing quantitative data