The A launderette operates a large washing machine. When working properly the duration of each

Question The A launderette operates a large washing machine. When working properly the duration of each wash is normally distributed with a mean of 50 minutes. The manager tests the machine by carrying out 5 washes and obtains a sample average of 55 minutes with a standard deviation of 5 minutes. What is the probability of this result when the null hypothesis is true?

A team of researchers at Gilead is interested in analyzing the effect of Remdesivir, a

Question A team of researchers at Gilead is interested in analyzing the effect of Remdesivir, a novel antiviral drug, on treating the symptoms of COVID-19. 100 diagnosed patients who tested positive and reported mild to moderate symptoms were recruited. 50 of them were randomly assigned to receive Remdesivir, and 50 received sugar pills that looked and tasted similarly to Remdesivir. All patients were unaware which they received. Two weeks later, all 100 patients were evaluated for moderate to severe symptoms again by an independent physician, unaware of the experiment.A dataset containing the results of the second evaluation and medical information of each patient was sent to the statistics department and analyzed by a statistician. It was found that 40 patients who took the sugar pill still presented mild to moderate symptoms, whereas only 8 patients who took the Remdesivir presented mild to moderate symptoms.Which of the following best describes the design of study above:

Select one:a. Completely randomized design with single blinding.b. Completely randomized design with double blinding.c. Observational study with double blinding.d. Randomized block design with single blinding.Which group of patients was affected by the placebo effect?

Select one:a. The group that received sugar pills.b. The group that received Remedesivir.c. Both groups.d. Neither group because a placebo was not used in the study.The researchers recorded the age and weight of each patient. In the Remdesivir group, the average age of the patients was 35, while in the sugar-pill group, the average age was 54. Also, the average weight of the patients in the Remdesivir group was 140.2, while in the sugar-pill group it was 140.0. Based on this information and the results from the second evaluation, what conclusion can you make about Remdesivir?

Select one:a.Remedesivir is effective since significantly fewer patients reported mild to moderate symptoms is the second evaluation.b. No conclusion can be made because weight is a lurking (or confounding) variable.c. No conclusion can be made because age is a lurking (or confounding) variable.d.No conclusion can be made because the researchers were biased. They expected Remedesivir to work beforehand.

16) Samuel recently got his first dog, and he’s considering if he should pay for

Question 16) Samuel recently got his first dog, and he’s considering if he should pay for professional dog training. He’s skeptical paying for this training is worth it, but fortunately Samuel is a statistician and friends with some researchers at the veterinary school. They randomly recruit 70 dogs to take part in the study, and a respected pet trainer in the region agrees to help train these dogs as part of the study.

Prior to the study, Samuel and the vets pair off all the dogs based on both biological characteristics as well as owner characteristics. As a result, they have 35 pairs of dogs that are relatively similar. One dog in each pair is randomly chosen to receive the professional behavior training, while the other dog will not receive the training (but will still be trained by its owners).

After training the dogs for two months, a second professional dog trainer is brought in to assess the obedience levels of all the dogs. Assume they are able to do so and can convert their ratings to a 0-100 point scale (treat this as being quantitative and not categorical). A 100 is a perfectly obedient dog. The second dog trainer does not know which dog received the treatment and which received the control.What are the correct assumptions to check for this study before doing a hypothesis test?

Select one:a. It’s a random sample, and 70≥3070≥30 so we have a large enough sample size. We can do the hypothesis test.b. It’s a random sample, and 35≥3035≥30 so we have a large enough sample size. We can do the hypothesis test.c. It’s a random sample, and np0=70⋅0.5≥10np0=70⋅0.5≥10. We can do the hypothesis test.d. It’s a random sample, and dogs’ behaviors are known to be normally distributed. We can do the hypothesis test.At an α=0.01α=0.01 significance level, what’s our conclusion?

Select one:a. We fail to reject the null hypothesis and conclude there’s evidence that professional dog training services help train dogs better than normal owners typically do.b. We reject the null hypothesis and conclude there’s evidence that professional dog training services help train dogs better than normal owners typically do.c. We fail to reject the null hypothesis and conclude there’s insufficient evidence that professional dog training services help train dogs better than normal owners typically do.d. We reject the null hypothesis and conclude there’s insufficient evidence that professional dog training services help train dogs better than normal owners typically do.

QUESTION 20 sample mean happened to be 111.6, compute the test

Question QUESTION 20 sample mean happened to be 111.6, compute the test statistic.Round the answer to two decimal places. QUESTION 21A random sample of size 32 is obtained from a normally distributed population. The population standard deviation is equal to 3.3. The sample mean happened to be 24.5. For this hypothesis test, what will be the critical value (the relevant z-alpha)? Round the answer to three decimal places.

Samuel recently got his first dog, and he’s considering if he should pay for professional

Question Samuel recently got his first dog, and he’s considering if he should pay for professional dog training. He’s skeptical paying for this training is worth it, but fortunately Samuel is a statistician and friends with some researchers at the veterinary school. They randomly recruit 70 dogs to take part in the study, and a respected pet trainer in the region agrees to help train these dogs as part of the study.Prior to the study, Samuel and the vets pair off all the dogs based on both biological characteristics as well as owner characteristics. As a result, they have 35 pairs of dogs that are relatively similar. One dog in each pair is randomly chosen to receive the professional behavior training, while the other dog will not receive the training (but will still be trained by its owners).After training the dogs for two months, a second professional dog trainer is brought in to assess the obedience levels of all the dogs. Assume they are able to do so and can convert their ratings to a 0-100 point scale (treat this as being quantitative and not categorical). A 100 is a perfectly obedient dog. The second dog trainer does not know which dog received the treatment and which received the control.What are the correct hypotheses to use for this study?

34) Suppose that another random sample of 119 villagers is taken, and shockingly(!), has the

Question 34) Suppose that another random sample of 119 villagers is taken, and shockingly(!), has the same sample mean of 1.15 days and sample standard deviation of 0.21 days.This will provide _____________ evidence to suggest that the new system for distributing welfare payments has a shorter average delivery time, because the P-value will ___________ compared to the original sample.Select one:a. more ; decrease.b. less ; decrease.c. more ; increase.d. less ; increase.

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