An elementary school claims that the variation in reading score of its fourth grade students is less than some value. Determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed. O two-tailed O left-tailed O right-tailed
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A: Sol:- Two tailed test Hypothesis can be modeled as :-H0: μ = μ0Ha: μ ≠ μ0 Correct choice :-
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A:
Q: 1) Four drug companies are studying the effect of their new drugs. In its clinical trials, company A…
A: Hi! Thank you for the question, As per the honor code, we are allowed to answer one question at a…
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Q: An elementary school claims the mean score on the district reading test of its fourth grade students…
A: Given Information: An elementary school claims the mean score on the district reading test of its…
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A: As the direction is specified we easily can find the type of hypothesis.
Q: For a left-tailed test, if the p-value we reject the null hypothesis O True O False
A: Fir a left tail test ,if p value <alpha ,we reject the null hypothesis
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Q: An elementary school claims that the variation in reading score of its fourth grade students is less…
A: Given,claim: the variation in reading score of its fourthgrade students is less than some value.
Q: 9) A brewery claims that the mean amount of beer in their bottles is at least 12 ounces. Determine…
A: The claim is that the mean amount of beer in their bottles is at least 12 ounces.
Q: A brewery claims that the mean amount of beer in their bottles is at least 12 ounces. Determine…
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Q: In what way is heuristics linked to hypotheses?
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- Consider trying to predict the life expectancy of citizens in a country based on the birth rate (per 1000 people) in that country. Here is a scatterplot of the data from a random sample of 50 countries. > ggplot (SampCountries, aes (BirthRate, LifeExpectancy)) + geom_point (color = "darkred")+ labs (title = "Life Expectancy by Birth Rate") + Life Expectancy by Birth Rate 80 - 70 - 10 20 30 40 BirthRate Here is (some of) the R output for the linear model for this data. > LifeBirth.lm summary (LifeBirth. lm) Call: Im (formula = LifeExpectancy BirthRate, data = SampCountries) Residuals: Min 10 Median 30 Маx -7.0592 -2.3047 0.9123 2.5019 5.8358 Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) 85.26295 1.03301 82.54 BirthRate -0.63291 0.04492 -14.09 Residual standard error: 3.424 on 48 degrees of freedom Multiple R-squared: 0.8053, Adjusted R-squared: 0.8012 F-statistic: 198.5 on 1 and 48 DF, p-value: < 2.2e-16 LifeExpectancyA local chess club claims that the length of time to play a game has a standard deviation of less than 11 minutes. Write sentences describing type I and type Il errors for a hypothesis test of this claim. A type I error will occur if the actual standard deviation of the length of time to play a game is V 11 minutes, but you the null hypothesis, A type Il error will occur if the actual standard deviation of the length of time to play a game is 11 minutes, but you the null hypothesis,The director of research and development is testing a new medicine. She wants to know if there is evidence at the 0.01 level that the medicine relieves pain in more than 335 seconds. For a sample of 85 patients, the mean time in which the medicine relieved pain was 338 seconds. Specify the type of hypothesis test. -Left tailed test -Right tailed test -Two Tailed test
- A 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,Cynthia, Mary, Mika, and Sallieof Hu’s Ur Dedi Cerveza Corp. conducted a survey on their 12-ounce cans to be sure that the variance of the amount of beer, in each can, was no more than 0.02square ounces. They collected a random sample of twenty cans of their 12-ounce beer, pulled from their production line, and got a sample variance of 0.015square ounces. Assume that the amount of beer in all 12-ounce cans to be normally distributed. Help them: a.Construct a 95% confidence interval for the population variance. b.Construct a 99% confidence interval for the standard deviation.The data "sea_pets_samp" is a simple random sample of 100 cases from the dataset "seattlepets" from OpenIntro.Org. Each case is a registered pet in Seattle, WA between 2003 and 2018. There are 100 pets in the sample, and 29 of them are cats. Question: "With 95% confidence, what percent of registered pets in Seattle, WA between 2003 and 2018 were cats?"
- In the past, the mean running time for a certain type of flashlight battery has been 8.1 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has changed as a result. This test would be a (a) left-tailed test (b) two-tailed test (c) right-tailed test The test is (Enter a, b, or c)Dogsled drivers, known as mushers, use several different breeds of dogs to pull their sleds. One proponent of Siberian Huskies believes that sleds pulled by Siberian Huskies are faster than sleds pulled by other breeds. He times 45 teams of Siberian Huskies on a particular short course, and they have a mean time of 7.4 minutes. The mean time on the same course for 37 teams of other breeds of sled dogs is 7.3 minutes. Assume that the times on this course have a population standard deviation of 1.5 minutes for teams of Siberian Huskies and 1.4 minutes for teams of other breeds of sled dogs. Let Population 1 be sleds pulled by Siberian Huskies and let Population 2 be sleds pulled by other breeds. Step 1 of 2: Construct a 90 % confidence interval for the true difference between the mean times on this course for teams of Siberian Huskies and teams of other breeds of sled dogs. Round the endpoints of the interval to one decimal place, if necessary. Answer E Tables E Keypad Keyboard Shortcut…Dogsled drivers, known as mushers, use several different breeds of dogs to pull their sleds. One proponent of Siberian Huskies believes that sleds pulled by Siberian Huskies are faster than sleds pulled by other breeds. He times 34 teams of Siberian Huskies on a particular short course, and they have a mean time of 7.6 minutes. The mean time on the same course for 50 teams of other breeds of sled dogs is 5.3 minutes. Assume that the times on this course have a population standard deviation of 1.1 minutes for teams of Siberian Huskies and 1.6 minutes for teams of other breeds of sled dogs. Let Population 1 be sleds pulled by Siberian Huskies and let Population 2 be sleds pulled by other breeds. Step 1 of 2: Construct a 95 % confidence interval for the true difference between the mean times on this course for teams of Siberian Huskies and teams of other breeds of sled dogs. Round the endpoints of the interval to one decimal place, if necessary. Answer E Tables E Keypad Keyboard Shortcuts…
- A local chess club claims that the length of time to play a game has a mean of 12 minutes or more. Write sentences describing type I and type II errors for a hypothesis test of this claim. ▼ 12 minutes, but you the null hypothesis, A type I error will occur if the actual mean of the length of time to play a game is ▼12 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 isA local chess club claims that the length of time to play a game has a mean of 12 minutes or more. Write sentences describing type I and type Il errors for a hypothesis lést of thIS dlaim. 12 minutes, but you the null hypothesis, A type I error will occur if the actual mean of the length of time to play a game is 12 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 isA local chess club claims that the length of time to play a game has a mean of 22 minutes or more. 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 A type II error will occur if the actual mean of the length of time to play a game is 22 minutes, but you 22 minutes, but you the null hypothesis, the null hypothesis,