Does Hand Washing Save Lives? In the mid-1800s, Dr. Ignaz Semmelweiss decided to make doctors wash their hands with a strong disinfectant between patients at a clinic with a death rate of
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- What term is used to express the likelihood of an event occurring? Are there restrictions on its values? If so, what are they? If not, explain.arrow_forwardQuestion 4. I Suppose 20.4% of students aged 7 to 13 years are overweight. A doctor thinks that the percentage of 7-to 13-year-olds who are overweight is different in her school district. a. State the null and alternative hypotheses in words. b. State the null and alternative hypotheses symbolically. c. Explain what it would mean to make a Type I error. d. Explain what it would mean to make a Type II error.arrow_forwardFor example before the pandemic, students from the 7:00am class reported that they sleep on average 6 hours. However, report shows that it is uncertain whether students sleep longer than six hours or less than 6 hours. Someone consulted you on how to provide statistical evidence whether the students sleep less than 6 hours or more than 6 hours. what test will you use to investigate the problem above?arrow_forward
- The national average SAT score is roughly 1500. We would like to see if the high school seniors who apply to Duke have higher than average SAT scores. We randomly sample 100 applicants' files and record their SAT scores. Which of the following is the correct set of hypotheses for this research question? Hint: think about how many samples we have data from. OHO: H= 1500; HA: µ = 1500 Ho: H Duke National; HA: H Duke National Ho: x= 1500; HA: x > 1500 OHO: H = 1500; HA: > 1500 O Ho: P = 1500; HA: P > 1500arrow_forwardLast year over 12,000 students took an entrance exam at a certain state university. Felipe's score was at the 73" percentile. Susan's score was at the 89"" percentile. (If necessary, consult a list of formulas.) (a) Which of the following must be true about Felipe's and Susan's scores? O Felipe scored higher than Susan. O Both Felipe and Susan scored higher than the median. O Susan answered 16 more questions correctly than Felipe. O Felipe's and Susan's scores were both in the bottom half of all scores. (b) Which of the following must be true about Felipe's score? O Felipe scored lower than about 73% of the students who took the exam. O Felipe got about 73% of the questions corect. O Felipe scored higher than about 73% of the students who took the exam. O Felipe got about 73% of the questions wrong.arrow_forwardIf you were assigned to develop an experiment to determine if adding specific insecticides will kill a specific type of insect on tomatoes, and you were using a hypothesis statement, you would be using what type of research? Select one. O Qualitative O Quantitativearrow_forward
- According to the Pew Research Center, 14% of adults rate basketball as their favorite sport. Your boss believes the proportion may be lower among adults over age 65, and wants you to collect evidence to see if this is true. You take a survey of adults over age 65, and only 12 out of 120 of them rate basketball as their favorite sport. You would like to set �=0.05. Your boss tells you that your firm will base some expensive decisions on the results of your hypothesis test, so a higher standard of evidence for rejecting the null hypothesis is needed. What should you do? Group of answer choices Keep the significance level the same but collect more data Increase the significance level to 10% Reduce the significance level to 1% Throw out observations that look suspicious thanksarrow_forwardMany questions in research can be expressed as two competing statements about the population parameter. These two statements are called the null and the alternative hypotheses. Usually, the researcher hopes the sample evidence will be in favor of the alternative hypothesis, the new theory. It is important to be able to state the theories that are being put to a test. Suppose that 40% of all supermarkets in the US use recyclable plastic bags. We would like to assess if the proportion of supermarkets in Michigan that use recyclable plastic bags is more than the stated rate. For this scenario, write out the hypotheses to be put to the test and define the parameter of interest in context of the problem. H0:Ha: The parameter p represents ___(provide appropriate definition in context)________arrow_forwardA certain virus affects 0.7% of the population. A test used to detect the virus in a person is positive 87% of the time if the person has the virus (true positive) and 14% of the time if the person does not have the virus (false positive). Fill out the remainder of the following table and use it to answer the two questions below based on a total sample of 100,000 people. Virus No Virus TotalPositive Test Negative Test Total 100,000a) Find the probability that a person has the virus given that they have tested positive. Round your answer to the nearest hundredth of a percent and do not include a percent sign. % b) Find the probability that a person does not have the virus given that they test negative. Round your answer to the nearest hundredth of a percent and do not include a percent sign. %arrow_forward
- How important is it to have more than one source before presenting any evidence to individuals to support your claim?arrow_forwardYou may need to use the appropriate appendix table or technology to answer this question. In 2012, seventy percent of Canadian households had an internet connection. A sample of 370 households taken in 2013 showed that 76% of them had an internet connection. We are interested in determining whether or not there has been a significant increase in the percentage of the Canadian households that have internet connect (a) State the nul and alternative hypotheses to be tested. (Enter l- for e as needed. Let p be the proportion of all Canadian households with Internet connections.) Ho H (b) Compute the test statistic. (Round your answer to two decimal places.) (c) The null hypothesis is to be tested at the 5% level of significance. Determine the critical value(s) for this test. (Round your answer(s) to two decimal places. If the test is one-taled, enter NONE for the unused tail.) test statisticS test statistic (4) What do you conclude? O Do not reject Ha. We can conclude that there has been a…arrow_forwardIf we wish to test the difference between three means what is the alternative hypothesis?arrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillHolt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGAL