Statistics question and answers for July 08, 2023
- Q A case-control study was performed to determine whether headinjury was associated with an increased risk of brain tumors inchildren. 200 cases with brain cancer were identified from thestate cancer registry...
- Q The following table shows ceremonial ranking and type of potterysherd for a random sample of 434 sherds at an archaeologicallocation.Ceremonial RankingCooking JarSherdsDecorated Jar Sherds(Noncooking)RowTotalA8946135B9550145C7876154ColumnTotal262172434Use a chi-square test to determine if...
- Q A professional astrologer has prepared horoscopes of 83 adults.Eachadult was shown three horoscopes, one of which was the one theastrologer prepared for themwhile the other two were randomly chosen from...
- Q The observations are listed : 5.32, 9.87, 11.25, 10.94, 5.58,6.29, 7.47, 10.75, 6.22, 8.00. Apply backward empirical rule,IQR/S, and normal probability plot to check the normalityassumption.
- Q 210 students were asked to randomly pick one of the numbers 1,2, 3, 4, 5, 6, 7, 8, 9, 10. The number 7 was picked by 61students.(c) Calculate a 90%...
- Q NYU is testing out two different versions of filtering softwarein order to reduce spam emails. The old version is called\"Spam-A-Lot\" and the new version is called \"Spam-A-Little.\" Intesting each version...
- Q An animal can be in one of two states A or B. An individual instate A will change to state B at an exponential rate α=1； anindividual in stat B...
- Q When σ is unknown and the sample is of size n≥ 30, there are two methods for computing confidence intervals forμ.Method 1: Use the Student's t distribution withd.f. = n...
- Q Cell phone talk time between charges is advertised as 10 hours.Assume that talk time is approximately normally distributed with amean of 10 hours and a standard deviation of 0.75 hours....
- Q Does changing the cutoff value for a prediction model change theCumulative Life Chart? Explain your answer.
- Q Cloud seeding has been studied for many decades as a weathermodification procedure (for an interesting study of this subject,see the article in Technometrics, \"A Bayesian Analysis of aMultiplicative Treatment Effect...
- Q Imagine that we have a population that is positively (right)skewed that has a mean of 114 and a standard deviation of 12. Usinga computer simulation program, Jake creates a sampling...
- Q Now please fill your homework to a blank A4 paper. Do notforget to write1- What is a correlation in statistics?2- What is the purpose of correlation?3- What are differences between...
- Q In a survey, 29 people were asked how much they spent on theirchild's last birthday gift. The results were roughly bell-shapedwith a mean of $33 and standard deviation of $15....
- Q Use the following multiple regression table to answer thefollowing questions:Daily DemandHigh TemperaturePriceDay14473$Â Â Â Â 1.0019064$Â Â Â Â 1.0000 = Weekend10873$Â Â Â Â 1.0011 = Weekday12082$Â Â Â Â 1.0015445$Â Â Â Â 1.2006954$Â Â Â Â 1.20112686$Â Â Â Â 1.2019970$Â Â Â Â 1.2004873$Â Â Â Â 1.5003366$Â Â Â Â 1.5009075$Â Â Â Â 1.5018161$Â Â Â Â 1.5011. What is...
- Q 15.9 For a sample of 8 employees, a personneldirector has collected the following data on ownership of companystock versus years with the firm.x = 5 Years 6 12...
- Q 1. The size of the left upper chamber of the heart is onemeasure of cardiovascular health. When the upper left chamber isenlarged, the risk of heart problems is increased. The...
- Q Q1. From a reputed store’s record it was found that weight ofsugar bags sold by it is normally distributed      with mean 1.0 lb. andstandard deviation of 40 g.a. What is...
- Q Q2. Distance (000, miles) traveled by a truck in a year isdistributed normally with μ = 50.0 and σ = 12.0.      Finda. the proportion of trucks areexpected to travel from...
- Q Suppose you have two groups, with Group 1's sample size being 76and Group 2's sample size being 68. The average of the first groupis 31.85 and a sample standard deviation...
- Q A consumer preference study compares the effects of threedifferent bottle designs (A, B, and C)on sales of a popular fabric softener. A completely randomizeddesign is employed. Specifically, 15 supermarkets of...
- Q Question 1:A binomial distribution has p = 0.21 and n = 94. Use the normalapproximation to the binomial distribution to answer parts (a)through (d) below. Round to four decimal places...
- Q global research study found that the majority of​ today'sworking women would prefer a better​ work-life balance to anincreased salary. One of the most important contributors to​work-life balance identified by the...
- Q You have collected data for 104 countries to address thedifficult questions of the determinants for differences in thestandard of living among the countries of the world. Your model hasthe relative...
- Q Corporate advertising tries to enhance the image of thecorporation. A study compared two ads from two sources, theWall Street Journal and the National Enquirer.Subjects were asked to pretend that their...
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