Researchers doing a study comparing time spent on social media and time spent on studying randomly sampled 200 students at a majoruniversity. They found that students in the sample spent an average of 2.3 hours per day on social media and an average of 1.8 hours perday on studying. If all the students at the university in fact spent 2.2 hours per day on studying, with a standard deviation of 2 hours, then:Select one:O a. the sample average is unbiased, since a proper random sample was taken from the population.O b. the sample average of 1.8 hours studying is biased, because it is not equal to 2.2.Oc. there is not enough information to choose an answer option.Od. the sample average is in error since, clearly, students study more.

Consider the random variables X1, X2, ..., Xn as a random sample from a population with mean µ. The…

Answered: Researchers doing a study comparing…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The ideal serving temperature of a particular type of red wine in 13 °C. A food critic is worried that even high-profile restaurants are unaware of this important fact and tend to serve this type of wine at a temperature that is too warm. He randomly selects 6 of the best restaurants, orders a bottle of this wine at each place, and measures the serving temperature with a precision thermometer. The mean temperate in his sample is 17.17 °C and the standard deviation is 3.69 °C. The food critic wishes to conduct a test at the .05 level of significance to see if these results provide evidence that the true mean serving temperature is indeed above 13 °C. Calculate the value of the test statistic. (Provide your answer as a number rounded to 3 decimals.)
The cost of unleaded gasoline in the Bay Area once followed an unknown distribution with a mean of $ 4.87 and a standard deviation of $ 0.05. A sample of 15 Bay Area gas stations are randomly chosen. We are interested in the average cost of gasoline for the 15 service stations. The distribution to use for the average cost of gasoline for the 15 service stations is: Select one: a. N (4.87, 0.0129) b. N (0.3247, 0.0006) c. N (4.87, 0.0033) d. N (4.87, 0.0002) e. N (0.3247, 0.0033)
According to a November 2014 Winthrop poll, of 852 polled SC residents, 222 of them said they plan to spend less on gifts this holiday season. Suppose 30% of all SC residents will spend less this holiday season. Identify the standard deviation of (all possible) sample proportions for SC resident who will spend less.
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Buyer's Digest is rating thermostats manufactured by two manufacturers, Thermorite and Tempking. In a recent test, 28 thermostats from Thermorite and 12 thermostats from Tempking were randomly selected and placed in a test room that was maintained at a temperature of 68°F. Average temperature readings were as follows: Thermorite: 68 Tempking: 66 Sample standard deviations were: Thermorite: 0.52 Tempking: 0.8 If we want to conduct a hypotheses test with a-05 to see whether the temperature reading variance for Thermorite is smaller than Tempking. what is the correct test statistic? (Round your answer to three decimal places) Test Statistic
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