The proportion of on-line shoppers who actually make a purchase appears to be relatively constant over time. In 2013, among a sample of 388 on-line shoppers, 160 purchased merchandise. In 2017, for a sample of 307 on-line shoppers, 144 purchased merchandise. At the 0.05 level of significance, did the proportion of on-line shoppers change from 2013 to 2017?   State the null and alternate hypotheses.         Make the decision rule. (Negative amounts should be indicated by a minus sign. Round your answers to 2 decimal places.)         Evaluate the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)         What is the decision regarding the null hypothesis?

Q: In a survey funded by the UW school of medicine, 750 of 1000 adult Seattle residents said they did…

A: Givenn=1000x=750p^=xn=7501000=0.75α=1-0.95=0.05α2=0.025zα2=z0.025=1.96

Q: To determine the possible effect of a chemical treatment on the rate of seed germination, 400…

A: Givenn1=400x1=350p1^=x1n1=350400=0.8750n2=320x2=308p2^=x2n2=308320=0.9625

Q: Recently, a large academic medical center determined that 10 of 25 employees in a particular…

A:

Q: A researcher studying reaction time of drivers states that, A 95% confidence interval for the time…

A:

Q: A study20 conducted in June 2015 examines ownership of tablet computers by US adults. A random…

A: It is asked yo test whether the proportions are different or not. So the null hypothesis will claim…

Q: Illustrate the null hypothesis for a correlated t test?

A:

Q: The P-value for this hypothesis was found to be:

A: The test statistic is, z=x¯-μσn=78-682025=104=2.5 The test statistic is 2.5.

Q: What proportion of those surveyed were in favor of tighter enforcement of governmen rules on TV…

A: The Plus-Four Confidence interval for a proportion is the method used to balance the error…

Q: According to a food website, the mean consumption of popcorn annually by Americans is 58 quarts. T…

A: Given Information:  Mean consumption (u) = 58 quarts

Q: For a two-tailed test at 86.12% confidence, if is known the critical value is

A: It is given that, the confidence level is 86.12.

Q: If you want to show that the use of vitamin C reduces the mean time to recover from a common cold,…

A: Given that For no vitamin, sample size n1 = 32, sample mean = 6.3, and sample SD = 2.7 For vitamin…

Q: 6. Based on the results of this hypothesis test, there is extremely strong evidence v of a linear…

A: The regression analysis is a statistical procedure that allow us to find the linear association…

Q: Recently, a large academic medical center determined that 8 of 19 employees in a particular position…

A: Solution: Given data X = 8 n =19 Pi = .54 Level Of significance = 0.05

Q: The records of a casualty insurance company show that, in the past, its clients have had a mean of…

A: Let σ denotes the population standard deviation of the number of accidents per day. The claim of the…

Q: In a study of the accuracy of fast food drive-through orders, one restaurant had 39 orders that were…

A: The random variable X follows binomial distribution. X ~B (n p). The number of successes is 39. The…

Q: The records of a casualty insurance company show that, in the past, its clients have had a mean of…

A: The claim of the test is that, the standard deviation of the number of accidents per day is no…

Q: State the null hypothesis, Ho, and the alternative hypothesis, Ha, that would be used to test each…

A: (a)   The claim of the test is “the mean weight of honeybees is at least 11 grams”   Null…

Q: he records of a casualty insurance company show that, in the past, its clients have had a mean of…

A: The null hypothesis can be defined as the hypothesis of no difference or equality, while the…

Q: In a random sample of 250 patients, 15 experienced dizziness. A pharmaceutical company claims that…

A:

Q: According to a reputable magazine, 33% of people in a certain large country have sleepwalked at…

A:

Q: In a study, Group 1 was found to have an average of 53 and a population standard deviation of 13 out…

A:

Q: For a two-sided confidence interval with 15 observations, Ox known, and a = 0.05 the (critical)…

A: Since the population SD is known the we will use the critical value of Z.

Q: A random sample of 25 college males was obtained and each was asked to report their actual height…

A: a) Given CI is 0.8 and 2.2, hence the null hypothesis that can be rejected is-  H0:μd=0.5, since 0.5…

Q: Find a 90% confidence interval for the difference between the population means for the two…

A: Given : For Sample 1 x̄1 = 3.11 n1 = 12

Q: In a hypothesis test, assuming the conventional critical value for evaluating p-values of 0.05, a…

A: We have given that  P-value  greater than level of significance ( alpha ) = 0.05 Alpha = level of…

Q: A random sample of 700 units from a large consignment showed that 200 were damaged. Find (i) 95% and…

A: Given Here, A random sample of 700 units consignment showed that 200 were damaged. we want i) 95%…

Q: find the critical value t of alpha over 2 used to construct  the confidence interval for a mean from…

A: It is given that n is 5 and level of significance is 0.02.

Q: If a previous researcher had predicted a population mean of 10 casual friends per person, could that…

A: Null Hypothesis:    H0: µ =10.   That is,   Alternate Hypothesis:   Ha: µ≠10   That is, the…

Q: A study is to be performed to determine a certain parameter in a community. From a previous study a…

A: We have given :  Standard deviation = 46 Sample error = 4 We have to find out n for 99% of…

Q: The records of a casualty insurance company show that, in the past, its clients have had a mean of…

A: Solution: Given information: μ= 1.8  Population mean σ= 0.05 Population standard deviation

Q: In a study of the accuracy of fast food drive-through orders, one restaurant had 32 orders that were…

A: Given values,

Q: The records of a casualty insurance company show that, in the past, its clients have had a mean of…

A: Given information Claim: - Standard deviation of the number of accidents per day is no longer equal…

Q: At a water bottling facility, a technician is testing a bottle filling machine that is supposed to…

A: The following information has been provided: A bottle filling machine that is supposed to…

Q: a) Choose the appropriate hypotheses such that rejection of H0 will support the conclusion that a…

A: Given : n=300 , p-hat=0.44 , p0=0.53 , α=0.01 Our aim is to test the claim that a smaller proportion…

Q: A random sample of 100 preschool children in MES revealed that only 60 had been vaccinated. Provide…

A: Given,n=100x=60p^=xnp^=60100=0.61-p^=1-0.6=0.4α=1-0.99=0.01α2=0.005Z0.005=2.5758     (from Z-table)

Q: A researcher studying reaction time of drivers states that A 95% confidence interval for the m time…

A:

Q: When the following hypotheses are being tested at a level of significance of a-0.05 with known…

A: Given :  Level of significance = 0.05 Sample size = 20 Population standard deviation is known.  H0:…

Q: Suppose that you run a Regression Model and the Regression Coefficient for X has an associated…

A: regression coefficient for X is β here confidence level = 99% so significance level = 1%

Q: The mayor of town believes that less than 51% of the residents favor construction of an adjoining…

A: We have to find  the null and alternatively hypotheses for the above scenario.

Q: Formulate the null and alternative hypothesis and identify the type of test. Tge manufacturer if a…

A: Given: μ= average nicotine content=2.5

Q: In a recent study, researchers were interested in the distractions caused by cell phones. In a…

A: Given that, Sample size n=738 Sample proportion of users admitted to walking into something while…

Q: b) Does the confidence interval for the slope contain zero? In other words, can we reject the null…

A: Sxy = ∑XY - ∑X∑Yn        = 29031 - 5224438= 29031 - 28905.75= 125.25   Sxx = ∑X2 - ∑X2n        =…

Q: The records of a casualty insurance company show that, in the past, its clients have had a mean of…

A: The claim is that the standard deviation of the number of accidents per day is no longer equal to…

Q: A survey of a random sample of 40 actuarial scientists who passed all their exams and are 7. working…

A:

Q: The test Statistic is           (round to 3 decimal places) The P value is

A: Given that sample size n = 200 And the sample proportion of people said they are confident of…

Q: Last year the mean cost u for a one-bedroom rental in a certain city was $1,200 per month., Eli is…

A: The summary of statistics is, x¯=1180,μ=1200 Let μ denote the mean for a one bed room rental in a…

Q: A random sample of 663 teens who said they did not typically eat fast food reported an average daily…

A: The conditions for conducting hypothesis test are, The samples must be drawn randomly. Each of the…

Q: A researcher studying reaction time of drivers states that, "A 95% confidence interval for the mean…

A: Givena 95% confidence interval for the meantime it takes for driver to apply the brakes after seeing…

Q: A 2011 survey, by the Bureau of Labor Statistics, reported that 91% of Americans have paid leave. In…

A: Thanks for giving opportunity to serve for bartleby students,   Hey, There ! Thank you for posting…