A medical researcher claims that less than 24% of adults in a certain country are smokers. In a random sample of 250 adults from that country, 18% say that they are smokers. At the significance level, is there enough evidence to support the researcher’s claim? Find the p-value and interpret its meaning Decide whether to reject or fail to reject the null using the p-value approach. Make an interpretation of your decision in the context of the claim.

Q: A driver's education course compared 1,500 students who had not taken the course with 1,850 students…

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Q: What specifically is used to decide whether to reject or fail to reject the null hypothesis? To…

A: Level of signicance is the pre-assigned value.

Q: An online poll asked: "Do you believe the Loch Ness monster exists?" Among 22,273 responses, 62%…

A: The population proportion is studied by taking samples from the population and comparing the sample…

Q: Assume that matched pairs of data from a poll of Internet users who were asked if they make travel…

A: +ve sign = 308-ve sign = 421ties = 30Total = 308+421+30        = 759significance level  0.05

Q: Use excel to obtain the test statistic and p-value. Make a decision about the null using the p-value…

A: The data set for the sleep and no sleep group,SleepNo sleep14813986913117109910131212811111491312The…

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A: B Double-blinding

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A:

Q: A certain drug is used to treat asthma. In a clinical trial of the drug, 24 of 286 treated subjects…

A: Given,n=286x=24and α=0.01

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A: a. To find whether the proportion of pf working students has changed, the null and alternative…

Q: Suppose that according to your company, the average salary for middle managers was 105,000. You…

A: (a)   Determine the type of test must be run.   The type of test that must be run is hypothesis…

Q: A high school wanted to know what percent of its students smoke cigarettes. Counselors selected a…

A: Population is the set of all objects of interest. Sample is s subset of the population. It is not…

Q: Consider a drug testing company that provides a test for marijuana usage. Among 308 tested subjects,…

A:

Q: Assume that you plan to use a significance level of a = 0.05 to test the claim that p1 = P2. Use the…

A: The sample size of PG-rated movies, n1=50 The ticket sales are 41%. i.e. The sample proportion,…

Q: A magazine reported that 47% of Canadians are confident they will take a winter vacation at some…

A: Given that  Sample size n =65 Favorable cases x =27 Sample proportion p^=x/n  =27/65 =0.4154 NOTE:-…

Q: A used car dealer claims that the median cost of a used car is $12,000. In a random sample of 15…

A: Given median cost of a used car = $12000Total number of used cars in sample = n = 15Total number of…

Q: If the P-value of a hypothesis test is 0.103, what would your decision be when the level of…

A: Given If the P-value of a hypothesis test is 0.103, what would your decision be when the level of…

Q: A survey was conducted to determine whether hours of sleep per night are independent of age. A…

A: a)It is needed to check whether hours of sleep are independent of age.

Q: A hypothesis test is conducted with a significance level of 10%. The alternative hypothesis states…

A: HypothesisThe P-value=0.27

Q: Assume that matched pairs of data from a poll of Internet users who were asked if they make travel…

A: Assume that matched pairs of data from a poll of Internet users who were asked if they make travel…

Q: Assume that matched pairs of data from a poll of Internet users who were asked if they make travel…

A:

Q: Assume that matched pairs of data from a poll of Internet users who were asked if they make travel…

A:

Q: It is a statement that is accepted when the sample data does not provide sufficient evidence to…

A:

Q: Professors collected data consisting of eye color and gender of statistics students. Among 1056…

A:

Q: A genetic experiment involving peas yielded one sample of offspring consisting of 439 green peas and…

A: Given DataTotal peas(n) = green peas + yellow peas = 439 + 160 = 599

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A: This is two sample proportion test. and also two tailed test.

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A: From the provided information, Level of significance (α) = 0.05 The test statistic is -2.43. The p…

Q: The College of Graduate Studies at MNSU claims that more than 60% of undergraduate students at this…

A:

Q: The table below includes results from polygraph​ (lie detector) experiments conducted by…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: d) Calculate your test statistic. Write the result below, and be sure to round your final answer to…

A: we have given that  n=54;  ¯x=40.66 pounds;  s=3.97 pounds  and alpha=0.05 NOTE:- According to…

Q: In a study, researchers surveyed college students on their use of apps to monitor their exercise and…

A: Formula Used: χ2 = ∑i=1n(O-E)2E Eij = RT-CTN RT = Row Total CT = Column Total

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A: It is given that a sample of offspring consisting of 442 green peas in which 142 are yellow peas.

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Q: In a study of 775 randomly selected medical malpractice lawsuits, it was found that 501 of them were…

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Q: The null hypothesis usually represents the   a. preconceived ideas of the researcher.     b. status…

A: A null hypothesis is a type of hypothesis used in statistics that proposes that there is no…

Q: Activity 1.1 Look for a sample survey online. Copy five questions and identify what kind of survey…

A: Types of survey questions:

Q: Suppose a researcher wanted to conduct a study to determine if there was a statistically significant…

A: A one-tailed test is a hypothesis test that tests if the mean population is less than or more than…

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A: The objective is to test the null hypothesis of no difference by using sign test at 0.05 level of…

Q: D. What is the conclusion based on the hypothesis test? Since the P-value is ( ) the significance…

A: Instruction : "please answer last three subparts. thank you!!"   The following information has been…

Q: how many of the 200 tests, using a significance level of 5%, will incorrectly find significance

A: Here given  We are conducting many hypothesis tests to test a claim. Assuming the null hypothesis is…

Q: (a) Write the claim mathematically and identify Ho and Ha Which of the following correctly states Ho…

A: 38,28,31,33,32,42,26,22,29,26,32,33,30,29,27,27,29,24sample size(n)=18=0.10

Q: If you perform a left-tail test, the p-value is less than the significance level. If you perform a…

A: Given values are population standard deviation  is knownstandardized z test statistic = -2.65 Level…

Q: Consider a drug testing company that provides a test for marijuana usage. Among 308 tested subjects,…

A: Given,n=308x=29p^=xnp^=29300=0.0967α=0.05

Q: The table below includes results from polygraph (lie detector) experiments conducted by researchers.…

A: We want to find the Chi square value by using contingency table.

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.