Basic Math question and answers for September 01, 2024
- Q An investment counselor calls with a hot stock tip. He believes that if the economy remains strong, the investment will result in a profit of $50,000. If the economy grows...
- Q The grades received by 300 students follow a normaldistribution. The mean of the grades is 75%, and the standarddeviation is 8%. (6 points: 2 points for correct drawing, 2 pointsfor...
- Q Assume that variables x and y have a significant and that the line of best fit has been as y 7.4 2.3x. One observation is = correltation, calculated (5, 14.4)....
- Q Health insurers and the federal government are both putting pressure on hospitals to shorten the average length of stay (LOS) of their patients. In 2003, the average LOS for non-heart...
- Q A manufacturing company measures the weight of boxes before shipping them to the customers. If the box weights have a population mean and standard deviation of 90 lb and 24...
- Q Find the range, variance, and standard deviation for the given sample data, if possible. If the measures of variation can be obtained for these values, do the results make sense?...
- Q Use this data in the problem below. Follow the steps carefully. Round to the nearest tenth.Lot 3:Week 1: 345Week 2: 340Week 3: 400Week 4: 325Step 1. Jim enters the data...
- Q Match the appropriated answer: You are performing a right-tailed t-test with a sample size of 3. If a=.01, and your test statistic is t-1.75, do you: The p-value for a...
- Q An investment of $135,000 was made by a business club. The investment was split into three parts and lasted for one year. The first part of the investment earned 8%...
- Q Based on historical data, your manager believes that 29% of the company's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion...
- Q Translate the statement into a confidence interval. Approximate the level of confidence.In a survey of 1006 adults in a country, 78% said being able to speak the language is at...
- Q A Gallup poll asked 1050 randomly chosen adults if they are familiar with the 2015 VW emissions scandal. Of this sample, 73% said that they were familiar with the scandal....
- Q Of 47 bank customers depositing a check, 16 received some cash back.(a) Construct a 90 percent confidence interval for the proportion of all depositors who ask for cash back. (Round...
- Q Heights (cm) and weights (kg) are measured for 100 randomly selected adult males, and range from heights of 138 to 191 cm and weights of 39 to 150 kg. Let...
- Q A restaurant purchased kitchen equipment on January 1, 2017. On January 1, 2019, the value of the equipment was $14,600. The value after that date was modeled as follows.V(t) =...
- Q A. Take a survey of at least five more people. You need a watch, stopwatch, or timer.B. First, record the age of the person you are surveying.C. Next, ask the...
- Q Consider the following two data sets:Data Set A: {28, 24, 22, 26, 23, 25, 26, 24, 25, 22, 29, 24, 23, 26}Data Set B: {50, 60, 31, 19, 88, 42,...
- Q A research study investigated differences between male and female students. Based on the study results, we can assume the population mean and standard deviation for the GPA of male students...
- Q The average speed of vehicles traveling of Interstate 5 Freeway (I-5) in California is 73 miles/hour and the standard deviation is 4.8 miles/hour. Assume the speeds are normally distributed. Write...
- Q A student was asked to find a 99% confidence interval for the proportion of students who take notes using data from a random sample of size n = 87. Which...
- Q CNN wants to conduct a political poll to determine who voters support in the upcoming presidential election. Pollsters are aware that opinions can be affected by geographical region, so they...
- Q According to a recent study, the mean number of hours college students spent studying per month was 75 hours with a population standard deviation of 25 hours. Two weeks before...
- Q A plastic bottle company is measuring the variation of the cap size that their newest machine produces. They gather the data from 1500 bottle caps and calculate the mean and...
- Q Exercise 6.16 presents the results of a poll where 48% of 331 Americans who decide to not go to college do so because they cannot afford it.(a) Calculate a 90%...
- Q Suppose we want to study the effect of smoking on lung capacity in women. Match the study to experimental or observational. Find 100 women age 20 who do not currently...
- Q A technology company is studying the launch of their new laptop computers in order to track warranty purchases. Assume that the laptop warranties have an unknown distribution with a mean...
- Q A Gallup poll asked 1200 randomly chosen adults what they think the ideal number of children for a family is. Of this sample, 53% stated that they thought two children...
- Q A newsgroup is interested in constructing a 99% confidence interval for the proportion of all Americans who are in favor of a new Green initiative. Of the 518 randomly selected...
- Q Translate the statement into a confidence interval. Approximate the level of confidence.In a survey of 1033 parents of children ages 8-14, 73% say they are willing to get a second...
- Q A researcher wishes to estimate, with 95% confidence, the population proportion of adults who eat fast food four to six times per week. Her estimate must be accuratewithin 3% of...
- Q [8 points] The Pew Research Center estimates that as of January 2014, 89% of 18-29 year olds in the United States use social networking sites. Calculate the probability that at...
- Q [6 pts] ACT, Inc. reported that 74% of 1644 randomly selected college freshmen returned to college the next year.a. Construct and interpret a 90% confidence interval to estimate the retention...
- Q A data set lists weights (lb) of plastic discarded by households. The highest weight is 5.12 lb, the mean of all of the weights is x=2.172 lb, and the standarddeviation...
- Q In a survey of 1033 parents of children ages 8-14, 73% say they are willing to get a second or part-time job to pay for their children's college education and...
- Q Luke took a survey of the age of six students in his college class. Their ages were 21, 22, 21, 24, 21,and 23. Luke found the mean, median, mode, and...
- Q In a random sample of 25 people, the mean commute time to work was 32.6 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and...
- Q A hotdog vendor must pay a monthly fee to operate a food cart in the city park. The cost in dollars of selling x hundred hotdogs in a month can...
- Q Find the following probability using the standard normal distribution.P(z < 1.7)Select the correct answer below:0.54310.86590.95540.7659
- Q The life of a Radio Shack record player is normally distributed with a mean of 3.3 years and a standarddeviation of 0.8 years. Radio Shack guarantees its record players for...
- Q Which of the following is not a discrete random variable?Multiple Choicethe number of times a light changes red in a 10-minute cyclethe number of minutes required to run 1 milethe...
- Q Listed below in order are prices in dollars for a Big Mac hamburger in the United States, Canada, Mexico, China, Japan, Russia, Switzerland, Italy, Spain, Britain, India, and Egypt. Such...
- Q The amount of time to complete a physical activity in a PE class is approximately normally distributed with a mean of 34.7 seconds and a standard deviation of 6.9 seconds....
- Q The highway mileage (mpg) for a sample of 8 different models of a car company can be found below. Find the mean, median, mode, and standard deviation. Round to one...
- Q You are 18 years old, opening your first savings account, and are considering three options:BANK A is not FDIC insured, has an interest rate of 5%, and a minimum deposit...
- Q Which statistic (mean, median, or mode) is most appropriate in each of the following situation?Tables in the dining hall are numbered 1-12 for students who eat there. The principal calls...
- Q The first advertisement discussed in class states that the salespeople make an average of $1,000 per week. Suppose there are nine salespeople. What would the ninth person need to earn...
- Q The 8 students in Mrs. Barnes' class were asked how many minutes it takes them to get to school in the morning. Here is what they answered:6, 11, 10, 14,...
- Q One safe investment pays 10% per year, and a more risky investment pays 18% per year. A woman who has $138,400 to invest would like to have an income of...
- Q 54. At the school carnival, Ann is playing a game involving a stack of 10 index cards. Each card has a single number written on it: 1 card has a...
- Q A bank randomly selected 248 checking account customers and found that 111 of them also had savings accounts at this same bank. Construct a 95% confidence interval for the true...
- Q The Thundering Herd, an amusement park ride, is not open to patrons less than 54" tall. If the mean height of park patrons is 68" with a standard deviation of...
- Q Salma wants to find the average height of students in the 12th grade at West High School. So she will use the heights of 44 students in the 12th grade...
- Q (a) A botanist at a nursery wants to inspect the health of the plants at the nursery. Which of the following best describes a systematic sample of plants? The botanist...
- Q c) A facilities supervisor at a sports stadium wants to rate the condition of the seats at the stadium. Which of the following best describes a stratified sample of seats?The...
- Q The lifetime of a certain brand of battery is known to have a standard deviation of 11.5 hours. Suppose that a random sample of 90 such batteries has a mean...
- Q Here are the shopping times (in minutes) for a sample of 5 shoppers at a particular grocery store.26, 31, 35, 23, 20Send data to calculatorFind the standard deviation of this...
- Q A tour company in a major city has a daily sightseeing trip. Each day, tour officials record the number of people making the trip. The data for a selection of...
- Q An investment company advertised that last year its clients, on average, made a profit of 9%. Assuming that average refers to the mean, which of the following claims must be...
- Q In which of the following circumstances would a post-hoc test (e.g., Tukey's HSD) be used?when the F-ratio is not significantwhen Ho is rejected and there are more than two treatmentswhen...
- Q A researcher predicts that dog owners living in the rural area spend different amount of time walking their dogs as compared to dog owners living in the city. The researcher...
- Q In a certain city of several million people, 5.7% of the adults are unemployed. If a random sample of 280 adults in this city is selected, approximate theprobability that at...
- Q A study measured the average rainfall in 130 months in the state of Hawaii. The average monthly rainfall was 3.7 inches with a standard deviation of 0.3 inches. Assume the...
- Q Find the sample group of the following example:Darwin asks every person at the city's baseball game what their favorite sport is to find out the most popular sport in the...
- Q A researcher wants to investigate the effects of environmental factors on IQ scores. For an initial study, she takes a sample of 400 people who grew up as the only...
- Q A brokerage survey reports that 36% of all individual investors have used a discount broker (one that does not charge the full commission). If a random sample of 150 individual...
- Q In a grade 5 classroom the numbers 1 to 100 are written on the chalkboard. The teacher circles 10 numbers at random. What is the expected number of prime numbers...
- Q The manager of the local coffee shop is surveying her customers to determine if they prefer room for cream or no room for cream in their coffee cup. The results...
- Q Suppose that the lifetimes of TV tubes are normally distributed with a standard deviation of 1.2 years. Suppose also that exactly 35% of the tubes die before 4.5 years. Find...
- Q Shandra bought some belts online for $67. She used a coupon code to get a 20% discount. The website also applied a 5% processing fee to the price after the...
- Q A Pew Research report indicated that 73%, of teenagers aged 13-17 own smartphones. A random sample of 150 teenagers is drawn.Find the probability that more than 70% of the sampled...
- Q Which of the following would result in a confidence interval with a larger width?using a smaller sampleobtaining a sample with lower variabilityselecting a smaller % confidencenone of the above
- Q An educator claims that the average salary of substitute teachers in New York is at most $100 per day. A random sample of ten school districts is selected, and the...
- Q The spinner on a wheel of fortune can land with an equal chance on any one of ten regions. Three regions are red, four are blue, two are yellow, and...
- Q In a distribution where the mean is 80 and the standard deviation is 3, find the largest fraction of the numbers that could meet the following requirements. less than 74...
- Q A newspaper article states with 95% confidence that 55% to 65% of all high school students in the United States claimthat they could get a hand gun if they wanted...
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