Statistics question and answers for July 25, 2023
- Q Two coins are tossed at the same time. Let random variable bethe number of heads showing.a) Construct a probability distribution forb) Find the expected value of the number of heads.
- Q Consider the following data:Monthly Profit of a GymMonthJan-12Feb-12Mar-12Apr-12May-12Jun-12Jul-12Aug-12Sep-12Profit ($)5,6505,4035,0044,6775,1705,5986,4196,1695,903Step 2 of 5:What are the MAD, MSE and MAPE scores for the three-periodmoving average? Round any intermediate calculations, if necessary,to no...
- Q A nutritionist is interested in determining the percentage ofAmerican adults who eat salad at least once a week. She takes arandom sample of 200 American adults and finds that 176...
- Q In 4 sentences, explain when would be appropriate tochoose the following tests? [Hint: type of variables involved,information the test provides] (2 pts each)a) Chi-squared testb) Kaplan-Meier Survival Curvec) Correlation Analysisd)...
- Q Determine the correlation for the following joint probabilitydistribution:x2424y3456fx,y(x,y)1/81/41/21/8a.Correlation = 0.6387b.Correlation = 0.0377c.Correlation = 0.3737d.Correlation = 0.8023
- Q Q1. Consider the population of adult females resident inMelbourne. Our focus is on the population mean height. Assume weknow ? (population standard deviation) is 25, but we do not knowthe...
- Q Consider a  two-sample t-test.Why is the sign of the t-test arbitrary? .Why are the degrees of freedom associated with the dependentgroups t-test always smaller than the degrees of freedom for theindependent...
- Q The regression equation is always the best predictor of ay-value for a given value of x. Defend your answer.
- Q A new drug cures 70 ​% of the patients to whom it isadministered. It is given to 28 patients. Find the probabilitiesthat among these​ patients, the following results occur. Use...
- Q What is the minimal sample size needed for a 95% confidenceinterval to have a maximal margin of error of 0.1 in the followingscenarios? (Round your answers up the nearest whole...
- Q The Milwaukee Theatre Guild has just received an anonymous$250,000 donation to be used as follows: $7500 block grants tochildren’s theatre groups, $6000 grants for new playwrights, and$5000 grants for theatre...
- Q draw statistics decision tree with 15 tests
- Q Identify the type of test (chi-square, t-test, orANOVA) that we have to use in each of the following scenarios.Explain why you chose that test.We want to compare males and females...
- Q A pharmaceutical company tested four formulations of a painrelief medicine for migraine headache sufferers. For theexperiment, 32 volunteers were selected and 8 were randomlyassigned to one of four drug formulations....
- Q Blind Spot Lab: What percent of the mean is the standarddeviation?- The percentages were 73% and 90%. What does this mean inreference to variability?
- Q Annual starting salaries for college graduates with degrees inbusiness administration are generally expected to be between$42,000 and $59,800. Assume that a 95% confidence interval estimateof the population mean annual starting...
- Q The Tinyton Public School Board istaking bids on the city’s four school bus routes. Four companieshave made bids. X denotes that a particular company did not make abid on a...
- Q A manufacturing company produces electrical insulators. If theinsulators break when in use, a short circuit is likely to occur.To test the strength of the insulators, destructive testing iscarried out to...
- Q A psychologist conducted a survey of the attitude towards thesustainability of American energy consumption with 250250 randomlyselected individuals several years ago. The psychologist believesthat these attitudes have changed over time....
- Q Match each situation with the correct statistical technique.Group of answer choices:HistogramWilcoxon Rank Sum        Chi-square test        Two sample t test         Median (Q1, Q3)        Count (%)        Bar...
- Q Question 8: A machine at AMT & Co. fills120-ounce jugs with laundry softener.A quality control inspector wishes to test if the machineunderfills the jugs or not. Assumethe distribution of the...
- Q A queueing system serves two types of customers. Type 1customers arrive according to a Poisson process with a mean rate of5 per hour. Type 2 customers arrive according to aPoisson...
- Q A poll was conducted on voter’s opinions on two candidates withmargin of errors at 3.5%. Candidate A 38% Candidate Z 41% Undecided21%(a) Can we conclude that Candidate Z has a...
- Q In a study of red/green color blindness, 1000 men and 700 womenare randomly selected and tested. Among the men, 92 have red/greencolor blindness. Among the women, 19 have red/green colorblindness....
- Q A study is done to test the claim that Company A retains itsworkers longer than Company B. Company A samples 16 workers, andtheir average time with the company is 5.2...
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