Basic Math question and answers for September 09, 2024
- Q The average salary of all workers in a auto manufacturing plant is $37,000 in a study about the plant. Does this value describe a population parameter or a sample statistic?Sample...
- Q Question Help To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a safety engineer conducts braking tests for 35 models of...
- Q A distribution has a mean of 300 and a standard deviation of 45. What is the probability that a score is less than 210? Use the 68-95-99.7 rule.68%16%95%2.5%
- Q Consider the following statistics. Sample size (n) = 10 Sample mean (T) = 66 Sample variance (S) = 10 If the population mean is 64, is there a significant difference...
- Q A printer cartridge company claims their ink lasts for more than 5,000 words. The number of words printed is normally distributed with a standard deviation of 20 (?=20) A sample...
- Q A company owns 250 vehicles and keeps records on when the vehicle was purchased and all maintenance done on the vehicles. A sample of ten vehicles is safety tested. The...
- Q What is the correct meaning of statistical significance?The result is statistically important.The result is statistically meaningful.The result is significant and due to chance..The result is significant and, therefore, is not...
- Q What is the degree of freedom for the critical t-value of a population that has 450 sample differences?224449225451
- Q Classify the two given samples as independent or dependent.Sample 1:The average test scores of 50 math studentsSample 2: The average test scores of the same 50 math students after being...
- Q A credit card company claims that the mean credit card debt for individuals is greater than $5,200. You want to test this claim. You find that a random sample of...
- Q Test a claim that the mean amount of carbon monoxide in the air in U.S. cities is less than 2.31 parts per million. It was found that the mean amount...
- Q What conditions are necessary in order to use the z-test to test the difference between two population means?Select all the necessary conditions below.A. The samples must be randomly selected.B. The...
- Q In an effort to estimate the mean dollars spent per visit by customers of a food store, the manager has selected a random sample of 100 cash register receipts. The...
- Q Identify the claim and state Ho and H?.What is the claim?A. Male high school students have greater exam scores than female studentsB. Male high school students have lower exam scores...
- Q An educational organization in California is interested in estimating the mean number of minutes per day that children between the age of 6 and 18 spend watching television per day....
- Q Which of the following is not the decision rule for hypothesis test?If the P-value is less than alpha, then reject the null hypothesis.If the P-value is less than alpha, then...
- Q Casey conducted research on the amount of time people spent at the mall and the amount of money they spent. Casey calculated the line of best fit as f(x) =...
- Q Use the normal distribution of SAT critical reading scores for which the mean is 514 and the standard deviation is 109. Assume the variable x is normally distributed.(a) What percent...
- Q Question Help Aused car dealer says that the mean price of a three-year-old sports utility vehicle is $19,000. You suspect this claim is incorrect and find that a random sample...
- Q The standard deviation of a probability distribution is 85, and using the 68-95-99.7 rule, about 68% of the values lle between 540 and 710. What is the mean of this...
- Q Suppose that 288 out of a random sample of 400 letters mailed in the United States were delivered the day after they were mailed. Based on this, compute a 90%...
- Q Foresters use regression to predict the volume of timber in a tree using easily measured quantities such as diameter. Let y be the volume of timber in cubic feet and...
- Q A study from 2005 claims that high school students are active for 60 minutes a day on average. A researcher belleves this has decreased over time. He randomly selects a...
- Q The average number of accidents in a month is 112. Authorities believe that with the implementation of the new traffic rules this count will go down. Write down the competing...
- Q A traffic engineer plans to estimate the average number of cars that pass through an intersection each day. Based on previous studies the standard deviation is believed to be 52...
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