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Home Question Bank Math Statistics Archive 2024 December 24

Statistics Questions from Dec 24,2024

Browse the Statistics Q&A Archive for Dec 24,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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A newsletter publisher believes that over \( 71 \% \) of their readers own a Rolls Royce. For marketing purposes, a potential advertiser wants to confirm this claim. After performing a test at the 0.02 level of significance, the advertiser decides to reject the null hypothesis. What is the conclusion regarding the publisher's claim? Answer 2 Points O There is sufficient evidence at the 0.02 level of significance that the percentage is over \( 71 \% \). - There is not sufficient evidence at the 0.02 level of significance to say that the percentage is over \( 71 \% \). Shortcuts A manufacturer must test that his bolts are 2.00 cm long when they come off the assembly line. He must recalibrate his machines if the bolts are too long or too short. After sampling 169 randomly selected bolts off the assembly fine, he calculates the sample mean to be 2.05 cm . He knows that the population standard deviation is 0.29 cm . Assuming a level of significance of 0.01 , is there sufficient evidence to show that the manufacturer needs to recalibrate the machines? Step 3 of 3 : Draw a conclusion and interpret the decision. Answer 2 Points We reject the null hypothesis and conclude that there is insufficient evidence at a 0.01 level of significance that the mean length of the bolts is different from 2.00 cm and the machines need to be recalibrated. We fail to reject the null hypothesis and conclude that there is insufficient evidence at a 0.01 level of significance that the mean length of the bolts is 2.00 cm and the machines need to be recalibrated. We fail to reject the null hypothesis and conclude that there is sufficient evidence at a 0.01 level of significance that the mean length of the bolts is different from 2.00 cm and the machines need to be recalibrated. We reject the null hypothesis and conclude that there is sufficient evidence at a 0.01 level of significance that the mean length of the bolts is different from 2.00 cm and the machines need to be recalibrated. A manufacturer must test that his bolts are 2.00 cm long when they come off the assembly line. He must recalibrate his machines if the bolts are too long or too short. After sampling 169 randomly selected bolts off the assembly line, he calculates the sample mean to be 2.05 cm . He knows that the population standard deviation is 0.29 cm . Assuming a level of significance of 0.01 , is there sufficient evidence to show that the manufacturer needs to recalibrate the machines? Step 2 of 3 : Compute the value of the test statistic. Round your answer to two decimal places. Answer 2 Points A manufacturer must test that his bolts are 2.00 cm long when they come off the assembly line. He must recalibrate his machines if the bolts are tc long or too short. After sampling 169 randomly selected bolts off the assembly line, he calculates the sample mean to be 2.05 cm . He knows that th population standard deviation is 0.29 cm . Assuming a level of significance of 0.01 , is there sufficient evidence to show that the manufacturer needs to recalibrate the machines? Step 1 of 3: State the null and alternative hypotheses for the test. Fill in the blank below. Answer 2 Points Keyboard Shortcuts \begin{tabular}{l} A manufacturer must test that his bolts are 2.00 cm long when they come off the assembly line. He must recalibrate his machines if the bolts are too \\ long or too short. After sampling 169 randomly selected bolts off the assembly line, he calculates the sample mean to be 2.05 cm . He knows that the \\ population standard deviation is 0.29 cm . Assuming a level of significance of 0.01 , is there sufficient evidence to show that the manufacturer needs \\ to recalibrate the machines? \\ Step 1 of 3: State the null and alternative hypotheses for the test. Fill in the blank below. \\ \( \qquad H_{0}: \mu=2.00 \) \\ \hline\end{tabular} Timppa sai musiikin kokeista 9, 8, 10, 9 ja 9. Paljonko hänen tulee saada vähintään seuraavasta kokeesta, jotta kaikkien kokeiden keskiarvo pyöristyisi arvosanaan 9? 8 7 8 6 9 What is a scatter plot? If a scatter plot shows points that are closely clustered together, what can you infer about the correlation between the variables? Wat is die modus van die gemiddelde persentasies The first quartile of the values \( 42,35,63,7,28,21,4 \) is \( (28,7), 14,63) \) Which of the following is divisible by 2,3 and \( 5 ? \) \( (4,532,1.245,3.000,8,840) \)
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