Basic Math question and answers for August 30, 2024
- Q The summary statistics for a certain set of points are:n = 25, se = 6.04, ? (x-x) = 49.70 and b? = 3.05Assume the conditions of the linear model hold....
- Q Using the given margin of error, confidence level, and likely range for the observed value of the sample proportion, obtain a sample size that will ensure a margin of error...
- Q In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6977 subjects randomly selected from an online group involvedwith ears. There were 1312...
- Q A researcher wants to test the claim that the average salary of tattoo artists is different from $48,890. Heselects a random sample of 16 of these artists and finds the...
- Q Claim: Most adults would erase all of their personal information online if they could. A software firm survey of 532 randomly selected adults showed that 99.4% ofthem would erase all...
- Q Is pancakes and eggs or hot oatmeal with bacon a more filling breakfast for teenagers?Sixty student volunteers were randomly split into two groups and then randomly assigned theirbreakfast..One group is...
- Q A study at an amusement park found that, of 10,000 families at the park, 1670 had brought one child, 2110 hadbrought two children, 2440 had brought three children, 1420 had...
- Q Travel distance for employees at a large company is approximately normally distributed with a standard deviation of 9 km. If 33% of the employees travel no longer than 26.44 km...
- Q To get a C in history, Nandan must average 74 on four tests. Scores on the first three tests were 68, 78, and 62. What is the lowest score that...
- Q 95%(a) Construct a confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures.Let P? denote the proportion of patients who had...
- Q In a certain survey, 500 people chose to respond to this question: "Should passwords be replaced with biometric security (fingerprints, etc)?" Among therespondents, 51% said "yes." We want to test...
- Q Twenty different statistics students are randomly selected. For each of them, their body temperature (C) is measured and their head circumference (cm) ismeasured.a. For this sample of paired data, what...
- Q Type numbers in the boxes. 10 points A group of 40 college students from a certain liberal arts college were randomly sampled and asked about the number of alcoholic drinks...
- Q Select one answer.10 pointsgroups;A researcher wants to determine if preschool attendance is associated with high schoolgraduation for low-income students. She randomly assigns low-income children to twoone group will attend preschool...
- Q 1. In an auditorium, there are 22 seats in the first row and 28 seats in the second row. The number of seats in arow continues to increase by 6...
- Q Finding the sample size: Polls are to be conducted in two cities to determine the difference in the proportions of residents who believe that the economy willimprove over the next...
- Q Pretzels: In order to judge the effectiveness of an advertising campaign for a certain brand of pretzel, a company obtained a simple random sample of 100convenience store receipts the week...
- Q In one study, it was found that the correlation coefficient between two variables is 0.97.Which statement is true?There is strong positive association between the variables.There is a weak negative association...
- Q The size P of a certain insect population at time t (in days) obeys the function P(t) = 900 e 0.07t(a) Determine the number of insects at t=0 days.(b) What...
- Q An airline has determined that the average weight of a traveler's suitcase is 39.7 pounds, with a standard deviation of5.2 pounds.Assuming a normal distribution of suitcase weights, what percentage of...
- Q Matt is saving to buy a new motorcycle. If he deposits $50 at the end of each month in an account that pays an annual interest rate of 5.5%, how...
- Q The 6 participants in a 200-meter dash had the following finishing times (in seconds).28, 26, 28, 24, 27, 29Send data to calculatorAssuming that these times constitute an entire population, find...
- Q The weight of cabbage is normally distributed. A random sample of 25 cabbages hasa mean of 17.31 ounces and a standard deviation of 1.62 ounces. Using a 0.10 ofsignificance test...
- Q Ken earned a A-in his 5-cr English class, a B in a 4-cr physics class, a B+ in a 3-cr Spanish class, and an A in his 3-cr sociology class....
- Q A data set contains information on the grams of fat and number of calories in 27 different fast foods. The correlation coefficient between fat content and calories is determined to...
- Q The city of Raleigh has 8400 registered voters. There are two candidates for city council in anupcoming election: Brown and Feliz. The day before the election, a telephone poll of...
- Q In a recent issue of IEEE Spectrum, the lengths of several engineering conferences were announced. Four conferences lasted 4 days, thirteen lasted 6 days, six lasted 3 days, four lasted...
- Q A class of 22 students has taken an exam, and the mean of their scores is 76.5. One student takes the exam late, and scores 92. After including the new...
- Q In a neighborhood donut shop, one type of donut has 380 calories, seven types of donuts have 550 calories, six types of donuts have 350 calories, two types of donuts...
- Q Select the correct answer from the drop-down menu. There are 12,205 people living in Seaville. The mayor's office decided to conduct a survey regarding the town's zoning laws. The office...
- Q Pregnancy testing: A college student hasn't been feeling well and visits her campus healthcenter. Based on her symptoms, the doctor suspects that she is pregnant and orders apregnancy test. The...
- Q In a large population of college students, 20% of the students have experienced feelings ofmath anxiety. If you take a random sample of 10 students from this population, the standarddeviation...
- Q The distribution of IQ (Intelligence Quotient) is approximately normal in shape with a mean of 100 and a standard deviation of 20.According to the standard deviation rule, only% of people...
- Q Which of the following statements about the sampling distribution of the sample mean, x-bar,is true? Check all that apply.A. The distribution is normal regardless of the shape of the population...
- Q Using a random sample of 478 TV households, Acme Media Statistics found that 36.2% watched the final episode of "It Ain't Over Yet."a. Find the margin of error in this...
- Q The number of hours a light bulb burns before failing varies from bulb to bulb. The distribution of burnout times is strongly skewed to the right. The Central Limit Theorem...
- Q Assume that the U.S. Mint manufactures dollar coins so that the standard deviation is 0.0390 g. The accompanying list contains weights (grams) of dollar coins manufactured with a new process...
- Q 10 pointsAccording to a 2014 research study of national student engagement in the U.S., the averagecollege student spends 17 hours per week studying. A professor believes that students at hercollege...
- Q A random variable is normally distributed with a mean of 50 and a standard deviation of 5. What is the probability the randomvariable will assume a value between 45 and...
- Q Suppose that a study of 1000 female teenagers in Atlanta found that 234 of them gave birth in 2016.Given that the population proportion is understood to be p=0.245, what would...
- Q Suppose that the distribution for total amounts spent by students vacationing for a week inFlorida is normally distributed with a mean of 650 and a standard deviation of 120. Supposeyou...
- Q Select one answer.Child Health and Development Studies (CHDS) has been collecting data about expectantmothers in Oakland, CA since 1959. One of the measurements taken by CHDS is the age of...
- Q Select one answer.Genetically modified foods: According to a 2016 Pew Research survey, a majority of theAmerican general public (56%) says that genetically modified (GM) foods are generally unsafe 10 pointsto...
- Q Dean Halverson recently read that full-time college students study 20 hours each week. Shedecides to do a study at her university to see if there is evidence that students study...
- Q A medical researcher is studying the effects of a drug on blood pressure. Subjects in the study Type numbers in the boxes. have their blood pressure taken at the beginning...
- Q Suppose that 25% of registered voters in North Carolina are registered Republican, 55% areregistered Democrat, and 20% are registered as Independent. A local paper wants to collect a sampleto help...
- Q According to a Pew Research Center study, in May 2011, 35% of all American adults had asmart phone (one which the user can use to read email and surf the...
- Q Find the p-value for the hypothesis test. A random sample of size 55 is taken. The sample has amean of 422 and a standard deviation of 85.Ho: = 400Ha: >400The...
- Q According to the Pew Research Center, the proportion of the American population who useonly a cellular telephone (no landline) is 37%. Jason claims that the proportion of youngAmerican adults who...
- Q Facebook friends: According to Facebook's self-reported statistics, the average Facebookuser has 130 Facebook friends. For a statistics project a student at Contra Costa College (CCC) tests the hypothesis that CCC...
- Q According to the CDC, the rate of Cesarean births in the United States in 2013 was about 33%. Type numbers in the boxes.ab PSuppose a random sample of 200 births...
- Q In a weight loss program, a simple random sample of 41 individuals was taken. After 12 months, their mean weight loss was 2.1 pounds, and s, their sample standard deviation...
- Q Commute times in the U.S. are heavily skewed to the right. We select a random sample of 480 Type numbers in the boxes.people from the 2000 U.S. Census who reported...
- Q Genetically modified foods: According to a 2016 Pew Research survey, a majority of the American general public (56%) says that genetically modified (GM) foods are generally unsafe to eat. This...
- Q Living with parents: The Pew Research Center reported that 36% of American Millennials(adults ages 18-31) still live at home with their parents. A group of students wants to conduct astudy...
- Q In March 2015, the Public Policy Institute of California (PPIC) surveyed 7,525 likely votersliving in California. In the survey, respondents were asked about global warming. PPICresearchers are interested in the...
- Q A group of 70 college students from a certain liberal arts college were randomly sampled andasked about the number of alcoholic drinks they have in a typical week. The purpose...
- Q A radio station claims that the amount of advertising each hour has a mean of 16 minutes and a sample variance of 1.9 minutes. You listen to the radio sta-...
- Q Gerald had scores of 87, 99, 96, and 81 on four exams in his algebra class. What score will he need on his fifth exam to have an overall average...
- Q Criminal investigators use biometric matching for fingerprint recognition, facial recognition,and iris recognition. When matching fingerprints, each subject is given a mean match score for 10 points how well their fingerprint...
- Q The following is an excerpt from a press release on the AFL-CIO website published in Octoberof 2003.Wal-Mart exemplifies the harmful trend among America's large employers to shirk health insurance responsibilitiesat...
- Q A teacher is experimenting with computer-based instruction. In which situation could theteacher use a hypothesis test for a population mean?A. She gives each student a pretest. Then she teaches a...
- Q At the Kinglet School District, the average score over the past 5 years for the math portion of the Scholastic Aptitude Test (SAT) was 411. An educator believes that recent...
- Q If points on a scatterplot fall on a nearly-straight line that slopes downward, the two variables havea) a strong positive correlationb) a strong negative correlationc) a weak positive correlationd) a...
- Q The first quartile for wages at a coffee shop is $12.00 and the third quartile is $14.00. Whatpercentage of the workers make less than $14.00?a) 20%b) 25%c) 50%d) 75%
- Q In the article "Attitudes About Marijuana and Political Views" (Psychological Reports, 1973), researchers reported on the use of cannabis by liberals and conservatives during the 1970s. To test the claim...
- Q Students in a discussion of gun control in a sociology class at Foothill Community College argue that Republicans are more likely to oppose gun control than Independents. They use data...
- Q Tom is selling t-shirts and finds that if he sells them for d dollars each, he will sell S(d) t-shirts.What is Tom's revenue if he sells his t-shirts for d...
- Q To test the claim (at 1% significance) that the proportion of voters who smoked cannabis frequently was lower among conservatives, the hypotheses were Ho: P? P? = 0 Ha:P? P?...
- Q A tennis player keeps track of the number of balls he hits out of the court each game for four games. Here are his numbers: Game 1 15 balls out...
- Q Ages of Proofreaders At a large publishing company, the mean age of proofreaders is 36.2 years and the standard deviation is 3.7 years. Assume the variable is normally distributed. Round...
- Q Scores on the GRE (Graduate Record Examination) are normally distributed with a mean of 537 and a standard deviation of 86. Use the 68-95-99.7 Rule to find the percentage of...
- Q You report a 95% confidence interval for a proportion as 53% 4%. Choose the most accurate statement below.If you did this many times, 95% of the time the proportion you...
- Q Last year's freshman class at Big State University totaled 5,310 students. Of those, 1,258 received a merit scholarship to help offset tuition costs their freshman year (although the amount varied...
- Q A researcher wants to estimate the mean age of all Business Week readers at a 99% confidence level. She wants the margin of error tobe within 3.1 years of the...
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