Assuming the same sensitivity and specificity as calculated above, recreate the 2x2 table as if the test were applied to a general population where the prevalence of ovarian cancer in the age group under study is approximately one in 3,000. For illustration, use a total population size of 300,000, such that 100 have true disease. Use the sensitivity and specificity calculated above to generate cells ‘a’ and ‘d’ of the table, and fill the rest in by subtraction. What is the PPV of the test when administered in this population?

An antique collector believes that the price received for a particular item increases with its age and with the number of bidders. The file P13_14.xlsx contains data on these three variables for 32 recently auctioned comparable items. Estimate a multiple regression equation using the given data. Interpret each of the estimated regression coefficients. Is the antique collector correct in believing that the price received for the item increases with its age and with the number of bidders? Interpret the standard error of estimate and the R-square value for these data.

The Baker Company wants to develop a budget to predict how overhead costs vary with activity levels. Management is trying to decide whether direct labor hours (DLH) or units produced is the better measure of activity for the firm. Monthly data for the preceding 24 months appear in the file P13_40.xlsx. Use regression analysis to determine which measure, DLH or Units (or both), should be used for the budget. How would the regression equation be used to obtain the budget for the firms overhead costs?

Let’s suppose that you have a set of time-series variables, and you want to model the relationship between them. Read the situations given below and answer the questions. (200 words)a) Explain the statistical test if the linear combination (of time-series variables) is I(0).b) Which statistical test can be applied if all the series are integrated of the same order I(1). Justify your answer

The chart below is a summary of the main results of a test data set representing the population observed purchasing a virtual digital assistant. What does the accuracy rate indicate? Metrics Metric Value Accuracy (#correct) 178 Accuracy (%correct) 85.6 Specificity 0.88219 Sensitivity (Recall) 0.6 Precision 0.82400 F1 Score 0.88213 Success Class 1 Success Probability 0.4   Multiple Choice 85.6% of the population has purchased a virtual assistant. 60% of the observations are correctly classified. 85.6% of the observations are correctly classified. 14.4% of the observations are correctly classified.   Explain all the incorrect answers also

A firm has modeled its experience with industrial accidents and found that the number of accidents per year is related to the number of employees by the regression equation Y = 6.6 + 0.098*X. R-Square is 0.72. The regression is based on 20 annual observations. The firm intends to employ 480 workers next year. How many accidents do you project?       47.04 accidents     8.66 accidents     53.64 accidents     72% of the 480 workers     28.56 accidents

What is the implication of a data distribution with mean, median and mode being approximately equal?   Group of answer choices 1. The spread in the data are equal 2. The data are unstable 3. The data can not be plotted using a Histogram 4. The data are normally distributed 5. The data can not be plotted using a Box Plot

Why is it problematic to find the most useful numbers/statistics in football? Select all that apply 1 Football is younger than baseball, so good measures have not been found yet 2 Many football positions are dependent on other players, so it is hard to evaluate their own contribution to the win 3 Football is more complicated than baseball or basketball 4 Football season contains less games than in hockey or basketball; this inexperience leads to inconsistency of measures

A gaming company develops different game packages that are downloadable from their servers on the internet. They need to make sure the download speed of their servers is as planned and adjust the capacity of their servers anytime needed. They measure the download time of their software 6 times a day for 5 days as shown in the table below. The standard deviation of the download time is 4.5.                                               Download time in seconds Day 1 Day 2 Day 3 Day 4 Day 5 41 41 37 36 37 44 45 46 39 39 43 45 45 40 40 45 42 46 41 39 43 46 39 38 42 46 43 41 42 38     a. Construct an appropriate control chart (with two-sigma limits) to demonstrate if the download time is within the company’s expectation and the process is in control. (Round your answer to two decimal places.)

    41.The ______ are (is) used to determine the amount of money that an organization would save if it used a particular test in place of the test it currently uses to select employees. a.  Brogden-Cronbach-Gleser formula b.  Taylor-Russell Tables c.expectancy charts d.  Lawshe tables   42.When the criterion validity coefficient is ____, and the selection ratio is ____, a test will have the most utility in selecting successful employees. a.  large / large b.  large / small c.small / small  d.  small / large   43.A test is considered to have _____ if there are race differences in test scores that are unrelated to the construct being measured. a.  differential validity       b.  measurement bias c.selection bias        d.  adverse impact   44.If the selection rate for any of the protected groups is less than 80% of the…