Statistics question and answers for November 21, 2023
- Q Click here to view the t Distribution Area in Right Tail a If x 46 9 and s 12 5 compute the test statistic to Round to three decimal places...
- Q According to a recent Pew Research poll 67 of Americans say that the U S economic system favors the powerful In a recent sample of 290 Americans 245 agreed that...
- Q A presidential candidate plans to begin her campaign by visiting the capitals in 4 of 46 states What is the probability that she selects the route of four specific capitals...
- Q A student wants to simulate 44 birthdays but she does not have a calculator or software program available so she makes up 44 numbers between 1 and 365 Is it...
- Q Find the midrange for the data items in the given frequency distribution Score x Frequency f 70 2 71 2 72 1 73 5 The midrange is Type an integer...
- Q Below are the times in days it takes for a sample of 14 customers from Jack s computer store to pay their invoices 19 15 43 39 35 31 42...
- Q You are given that sin A your answer as a fraction 1 25 H with A in Quadrant IV and cos B with B in Quadrant III Find sin A...
- Q The New York City Marathon is a highly selective race One way to gain entry into the race is to qualify based on a time from a prior completed marathon...
- Q A survey was conducted that asked 1013 people how many books they had read in the past year Results indicated that x 10 4 books and s 16 6 books...
- Q Determine the two values of z such that the middle 28 of the data lie between the two z values Round the solutions to two decimal places as z values...
- Q SAT college entrance test scores are known to be a normally distributed with a mean of 1100 and a standard deviation of 90 Determine the 45th percentile of all SAT...
- Q In a survey of 2147 adults in a recent year 1202 say they have made a New Year s resolution Construct 90 and 95 confidence intervals for the population proportion...
- Q The table available below shows the costs per mile in cents for a sample of automobiles At a 0 05 can you conclude that at least one mean cost per...
- Q quadratic regression using a graphing calculator to determine a quadratic function that could be used to model the data in the table below Horizontal Distance ft Reflect in ePortfolio 0...
- Q humane society claims that less than 70 of households in a certain country own a pet In a random sample of 600 households in that country 396 say they own...
- Q A humane society claims that less than 72 of households in a certain country own a pet In a random sample of 700 households in that country 483 say they...
- Q A research center claims that 29 of adults in a certain country would travel into space on a commercial flight if they could afford it In a random sample of...
- Q The mean incubation time for a type of fertilized egg kept at a certain temperature is 23 days Suppose that the incubation times are approximately normally distributed with a standard...
- Q A study found that the mean amount of time cars spent in drive throughs of a certain fast food restaurant was 136 7 seconds Assuming drive through times are normally...
- Q he mean incubation time for a type of fertilized egg kept at a certain temperature is 23 days Suppose that the cubation times are approximately normally distributed with a standard...
- Q Find the indicated probability Round to the nearest thousandth 16 A sample of 4 different calculators is randomly selected from a group containing 18 that are defective and 40 that...
- Q A politician claims that the mean salary for managers in his state is more than the national mean 80 000 Assume the the population is normally distributed and the population...
- Q 18 18 A state lottery involves the random selection of six different numbers between 1 and 31 If you select one six number combination what is the probability that it...
- Q A machine that produces a special type of transistor a component of computers has a 2 defective rate The production is considered a random process where each transistor is independent...
- Q Find the indicated probability Express your answer as a simplified fraction unless otherwise noted 15 The following table contains data from a study of two airlines which fly to Small...
- Q B Points Monday through Thursday when there isn t a holiday the average number of vehicles that visit a particular retailer between 2pm and 3pm each afternoon is 6 4...
- Q Suppose that about 73 of 18 20 year olds consumed alcoholic beverages in any given year We now consider a random sample of eighty 18 20 year olds a How...
- Q Do a majority of U S adults believe raising the minimum wage will help the economy or is there a majority who do not believe this A survey of 1...
- Q 11 A bag contains 6 red marbles 3 blue marbles and 1 green marble Find P not blue
- Q 10 The table below describes the smoking habits of a group of asthma sufferers Men Women Nonsmoker 433 408 Occasional Regular smoker smoker 66 70 50 31 2 Heavy smoker...
- Q A IRS auditor randomly selects 3 tax returns from 45 returns of which 15 contain errors What is the probability that she elects none of those containing errors Round to...
- Q From the information provided create the sample space of possible outcomes Flip a coin three times
- Q The mean gas mileage for a hybrid car is 57 miles per gallon Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3 5 miles...
- Q The mean incubation time of fertilized eggs is 22 days Suppose the incubation times are approximately normally distributed with a standard deviation of 1 day a Determine the 19th percentile...
- Q In horse racing a trifecta is a bet that the first three finishers in a race are selected and they are selected in the correct order Does a trifecta involve...
- Q In a certain instant lottery game the chances of a win are stated as 6 in 25 Express the indicated degree of likelihood as a probability value between 0 and...
- Q How could you use a random digit generator or random number table to simulate rain if you knew that 50 of the time with conditions as you have today it...
- Q A student wants to simulate 28 birthdays but she does not have a calculator or software program available so she makes up 28 numbers between 1 and 365 Is it...
- Q In a certain study the chances of movies with a female lead role are stated as 28 out of 100 Express the indicated degree of likelihood as a probability value...
- Q A random sample of 81 eighth grade students scores on a national mathematics assessment test has a mean score of 279 This test result prompts a state school administrator to...
- Q Suppose the monthly charges for cell phone plans are normally distributed with mean 68 and standard deviation o 19 a Draw a normal curve with the parameters labeled b Shade...
- Q Suppose the birth weights of full term babies are normally distributed with mean 3450 grams and standard deviation o 505 grams Complete parts a through c below b Shade the...
- Q Determine whether the following graph can represent a normal density function Could the graph represent a normal density function
- Q Determine if the following statement is true or false The normal curve is symmetric about its mean Choose the best answer below OA The statement is true The mean is...
- Q a What happens to the graph of the normal curve as the mean increases b What happens to the graph of the normal curve as the standard deviation decreases This...
- Q Draw a normal curve with 66 and o 20 Label the mean and the inflection points Choose the correct graph of the normal curve below OA OB 1 66 86...
- Q The relative frequency histogram represents the length of phone calls on George s cell phone during the month of September Determine whether or not the histogram indicates that a normal...
- Q A study was conducted that resulted in the following relative frequency histogram Determine whether or not the histogram indicates that a normal 0 4T distribution could be used as a...
- Q A dreidel is a four sided spinning top with the Hebrew letters nun gimel hei and shin one on each side Each side is equally likely to come up in...
- Q possible for their children to have brown eyes probability 0 75 blue eyes 0 125 or green eyes 0 125 a What is the probability the rst blue eyed child...
- Q me the point estimate of the population proportion the margin of error for the fo ce interval and the number of individuals in the sample with the specified cha sample...
- Q In your reference for this assignment be sure to include both your text class materials AND your outside reading s Initial Post Instructions 1 Present two different types of data...
- Q Aubrey buys a bag of cookies that contains 7 chocolate chip cookies 9 peanut butter cookies 5 sugar cookies and 8 oatmeal raisin cookies What is the probability that Aubrey...
- Q A very skilled court stenographer makes one typographical error typo per hour on average a What probability distribution is most appropriate for calculating the probability of a given number of...
- Q A nonprofit wants to understand the fraction of households that have elevated levels of lead in their drinking water They expect at least 5 of homes will have elevated levels...
- Q WorkoutHours TVHours StressLevel Pearson Correlation Sig 2 tailed N Pearson Correlation Sig 2 tailed N Pearson Correlation Sig 2 tailed N 1 40 233 149 40 428 006 40 233...
- Q Model R Square 1 431a 186 a Predictors Constant TVHours WorkoutHours Model 1 R Constant WorkoutHours TVHours Square a Dependent Variable StressLevel 142 Unstandardized Coefficients B Std Error 2 669...
- Q work as follows Tests Quizzes Problem Solving Summative Activity Final Exam Below are the marks that Christie received in each category Problem Category Solving 140 27 Christie s Mark 1...
- Q 4 Your statistics instructor claims that 60 percent of the students who take her Elementary Statistics class go through life feeling more enriched For some reason that she can t...
- Q 6 Dr Hafen is doing research on the effects of study time how many minutes students study on test performance their score on an exam He hypothesizes that the amount...
- Q 8 Why do we care about the variance accounted for r squared in a regression model
- Q 2 Previously an organization reported that teenagers spent 4 5 hours per week on average on the phone The organization thinks that currently the mean is higher Fifteen randomly chosen...
- Q 7 Why are both sample size N and effect size e g r important when conducting a hypothesis test
- Q 9 Please draw a scatterplot that shows a relatively strong association and one that shows a relatively weak association Be sure to label them well
- Q onstruct a boxplot for the given data Include values of the 5 number summary in all boxplots 6 The test scores of 32 students are listed below Construct a boxplot...
- Q 2 If we know that population mean is 17 population standard deviation is 4 5 conduct a two tailed z test to determine if the following data set allows us...
- Q Determine which score corresponds to the higher relative position 13 Which is better a score of 92 on a test with a mean of 71 and a standard deviation of...
- Q Find the percentile for the data value 14 Data set 55 38 30 66 67 68 44 Data value 55 Find the indicated measure 15 Use the given sample data...
- Q Solve the problem Round results to the nearest hundredth 10 The mean of a set of data is 5 73 and its standard deviation is 3 44 Find the z...
- Q Find the number of standard deviations from the mean Round your answer to two decimal places 11 The annual snowfall in a town has a mean of 38 inches and...
- Q Use the empirical rule to solve the problem 8 At one college GPA s are normally distributed with a mean of 2 9 and a standard deviation of 0 6...
- Q 9 The coefficient of variation expressed as a percent is used to describe the standard deviation relative to the mean allows us to compare variability of data sets with different...
- Q 5 List the following correlations from weakest to strongest d 22 a 33 b 74 c 81
- Q 1 Calculate the correlation coefficient for the relationship of interval variables X and Y in DATA SET A Make sure you show all of your work and demonstrate the use...
- Q 4 Why do we say that correlation does not equal causation Please give an example
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