Correlation between the error term, u, and any of the independent variables causes all of the OLS estimators to be Group of answer choices Consistent Inconsistent BLUE Unbiased None of the alternatives
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- In 2014, a survey found that 156 of 800 adults said they learned Japanese by watching anime and having the subtitles in English. Then in 2019 another survey was conducted and found that 240 of 1000 said they learned Japanese by watching anime and having the subtitles in English. Test the claim to see if there is a difference between the years of the surveys using a z-score of -2.08 and a 0.05 level of significance. a) Find Ho and H4. b) Find Test Stat, the critical value and analyze it. c) Write the Conclusion.The median number of part-time employees at fast-food restaurants in a particular city wasknown to be 18 last year. City officials think the use of part-time employees may be increasing.A sample of nine fast-food restaurants showed that seven restaurants were employing morethan 18 part-time employees, one restaurant was employing exactly 18 part-time employees,and one restaurant was employing fewer than 18 part-time employees. Can it be concludedthat the median number of part-time employees has increased? Test using a = .05.The median number of part-time employees at fast-food restaurants in a particular city was known to be 18 last year. City officials think the use of part-time employees may be increasing. A sample of nine fast-food restaurants showed that seven restaurants were employing more than 18 part-time employees, one restaurant was employing exactly 18 part-time employees, and one restaurant was employing fewer than 18 part-time employees. Can it be concluded that the median number of part-time employees has increased? Test using α = .05.
- The makers of Aspro brand aspirin want to be sure that their tablets contain the right amount of active ingredient (acetylsalicylic acid). So they inspect a random sample of 36 tablets from a batch in production. When the production process is working prop- erly, Aspro tablets have an average of μ = 320 milligrams (mg) of active ingredient. The amount of active ingredient in the 36 selected tablets has mean 319 mg_and_standard deviation 3 mg. 1. State appropriate hypotheses for a significance test in this setting. 2. Check that the conditions are met for carrying out the test. 3. Calculate the test statistic. Show your work. > 4. Use Table B to find the P-value. Then use technology to get a more accurate result. What conclusion would you draw?A study was conducted to examine how anxiety (measured on a metric scale) varies for people from different age groups (<18 years, 19 - 29 years, 30 - 39 years, 40+ years). It was hypothesised that people <18 years old would have the least anxiety of the four age groups. It was also hypothesised that people 40+ years old would have more anxiety than people 19-29 years old. Which of the following would be an appropriate statistical test to conduct, which addresses these hypotheses? Group of answer choices: Factorial ANOVA Multiple Regression Mixed ANOVA Single factor ANOVA Within Subjects ANOVAI want you to come up with three additional “third variables” that might explain the aggression / violent TV watching relationship. That is, list three different “Variable Cs” (and you cannot use “lack of parental supervision) that might be the true link between Variables A (aggression) and B (watching violent TV)
- Which of these comparisons between an ANOVA and a t test is correct? An ANOVA can be used to compare three or more conditions,whereas a t test cannot A t test can be used to compare two conditions,whereas an ANOVA cannot An ANOVA examines whether mean differences exist between conditions, whereas a t test does not A t test provides more flexibility in research studies than anA local chess club claims that the length of time to play a game has a mean of more than 44 minutes. Write sentences describing type I and type II errors for a hypothesis test of this claim. A type I error will occur if the actual mean of the length of time to play a game is 44 minutes, but you the null hypothesis, A type Il error will occur if the actual mean of the length of time to play a game is 44 minutes, but you the null hypothesis,The median number of part-time employees at fast-food restaurants in a particular city wasknown to be 18 last year. City officials think the use of part-time employees may be increasing. A sample of nine fast-food restaurants showed that seven restaurants were employing more than 18 part-time employees, one restaurant was employing exactly 18 part-time employees, and one restaurant was employing fewer than 18 part-time employees. Can it be concluded that the median number of part-time employees has increased? Test using α = 0.05
- Battery life is an important issue for many smartphone owners. Public health studies have examined "low-battery anxiety" and acute anxiety called nomophobia that results when a smartphone user's phone battery charge runs low and then dies.† Battery life between charges for the Samsung Galaxy S9 averages 31 hours when the primary use is talk time and 10 hours when the primary use is Internet applications. Because the mean hours for talk time usage is greater than the mean hours for Internet usage, the question was raised as to whether the variance in hours of usage is also greater when the primary use is talk time. Sample data showing battery life between charges for the two applications follows. 1)Test whether the variance is also greater when the primary use is talk timeA coin-operated coffee machine made by BIG Corporation was designed to discharge a mean of eight ounces of coffee per cup. If it dispenses more than that on average, the corporation may lose money, and if it dispenses less, the customers may complain. BIG Corporation would like to estimate the mean amount of coffee, u, dispensed per cup by this machine. BIG will choose a random sample of cup amounts dispensed by this machine and use this sample to estimate u. Assuming that the standard deviation of cup amounts dispensed by this machine is 0.40 ounces, what is the minimum sample size needed in order for BIG to be 90% confident that its estimate is within 0.05 ounces of u? Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements). (If necessary, consult a list of formulas.)In a typical experiment the researcher manipulates the independent or explanatory variable and then observes whether the hypothesized dependent variable is affected by the intervention. Choose any two examples of experiment and describe the independent and dependent variables