Several years​ ago, the mean height of women 20 years of age or older was 63.7 inches. Suppose that a random sample of 45 women who are 20 years of age or older today results in a mean height of 64.3 inches. ​(a) State the appropriate null and alternative hypotheses to assess whether women are taller today. ​(b) Suppose the​ P-value for this test is 0.13. Explain what this value represents. ​(c) Write a conclusion for this hypothesis test assuming an α=0.05 level of significance.

Q: How many students should be sampled in order to be 90% confident in estimating the proportion in…

A: Given that  Margin of error =E =0.10 90% confidence.

Q: an IQ test is designed so that the mean is 100 and the standard deviation is 16 for the population…

A: Given that, μ=100σ=16Margin of error=E=4α=0.1The critical value at α=0.1 is zα/2=1.645

Q: Historically, the mean systolic blood pressure (SBP) has been a rather high 139 units for adults in…

A:

Q: 3. Last semester, the mean on Exam 1 was 75. Identify the type I and type II errors for the…

A: It is claim that the mean this semester is less than 75. Thus, the null and alternative hypothesis…

Q: he president of a university believes the entering class this year has an average ACT score…

A: This is the right tailed test .

Q: hean amount paid by his firm for person- njury resulting from personal accidents 18,500. An actuary…

A: Given Xbar=19415 σ=2600 Level of significance=0.05 µ=18500

Q: State the statistical hypotheses (null and alternative) for a two-tailed test against a known…

A: In this context, the known population mean is 90.

Q: The average wait time to get seated at a popular restaurant in the city on a Friday night is 10…

A: It is given that the p-value is 0.9396.

Q: A college admissions officer for the school’s online undergraduate program wants to estimate the…

A: The objective of this question is to determine whether the true mean age of online undergraduate…

Q: A chicken farmer claims that his chickens have a mean weight of 58 ounces. The farmer takes a random…

A: In this problem, we will use z-test to solve the test statistic since the population standard…

Q: What is the likelihood that a randomly selected student from a population of 500 has a grade point…

A:

Q: Birna is studying the average height of male and female antelopes. The height of antelopes has been…

A: Given, Claim: The average height differs between the sexes. The test is two tailed. Given test…

Q: A psychologist claims that the mean age at which children start talking is 25 months. A sample of 18…

A:

Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A: From the provided information, Sample size (n) = 54 Out of which 35 involved an intoxicated driver.…

Q: Suppose the mean time spent in jail by a first time convicted burglar in the past was 2.5 years. A…

A: Given μ=2.5 years n=25 sample mean(x¯)=3 standard deviation(s)=1.5 Level of significance=0.05 This…

Q: The director of research and development is testing a new medicine. She wants to know if there is…

A: given that The director of research and development is testing a new medicine. She wants to know if…

Q: State the statistical hypotheses against a population with a mean of 90 for a one-tailed test where…

A: Given: μ=90 The hypotheses for testing the population mean is given bellow: Null hypothesis: H0:…

Q: The mean time spent solving this problem is 4.25 minutes with a standard deviation of 1.7 minutes.…

A: Given Information: Population mean (u) = 4.25  Standard deviation (s) = 1.7 Sample size (n) = 32…

Q: The average salary of North Carolina is reported to be $50,781. After completing a survey of 120…

A: Given,   Sample size = 120 Sample mean = 51203 Sample standard deviation = 2409   Set up the null…

Q: Starting engineers in the Philippines earned an average annual salary of P282,000. For the same…

A: GivenMean(x)=408000standard deviation(s)=274342sample size(n)=24α=0.1

Q: In 1980, women who were under 50 years old had a mean body weight of 145 pounds, with a standard…

A: Given Population of study - women who were under 50 years Mean, μ = 145 Standard deviation, σ = 20

Q: The mean number of eggs per person eaten in the United States is 278. Do college students eat less…

A:

Q: To estimate the benefits of an SAT prep course, a random sample of 10 students enrolled in the…

A: From the provided information, Sample size (n) = 10 The difference values are as follow:…

Q: What is the standard error of the mean for a sample that has n=53 people and comes from a population…

A: It is given that n = 53s = 11

Q: A hospital president claims that the average salary of registered nurses at her hospital is more…

A: Note: Hi there! Thank you for posting the question. As there are several independent questions,…

Q: A researcher wants to test the hypothesis that the mean weight of packages delivered by a certain…

A: given data claim : μ = 10n = 30x¯ = 9.8s = 1.5α = 0.05

Q: A study wants to test the mean time that people take to finish a crossword puzzle. The null…

A: Givensample size(n)=30Mean(x)=24standard deviation(s)=5significance level(α)=0.05

Q: The average American consumes 99 liters of alcohol per year. Does the average college student…

A: Note- Since you have posted a question with multiple sub-parts, we will solve the first three…

Q: The registrar would like to conduct a hypothesis test. The level chosen for the test will be  = 0.10

A: Given, x=2.34μ=2.53σ=1.04n = 100

Q: A village head wants to know the number of chickens in his area. So the Lurah conducted research on…

A:

Q: magazine reported that at the top 50 business schools in a​ region, students studied an average of…

A: Given that : A magazine reported that at the top 50 business schools in a​ region, students studied…

Q: A firm purchases a very large quantity of off-cutts metals and wishes to know the average weight of…

A:

Q: A researcher wishes to see if the mean number of days that a basic, low price, small automobile sits…

A: The random variable X follows normal distribution. We have to find the test value. This is one…

Q: Suppose that IQ scores have a bell shape distribution with a mean of 105 and a standard deviation at…

A: Solution: Let X represent the IQ scores of students.  The distribution of X is bell shape…

Q: You perform an ANOVA test comparing average height among patients at a hospital according to whether…

A:

Q: A newspaper claims that the mean time spent on physical activities by middle school children in UAE…

A: From the provided information, Sample size (n) = 20 The claim is that the mean time spent on…

Q: State the null and alternative hypothesis if I claim that the mean age of women is 5 or more than…

A: Solution: It is required to state the null and alternative hypotheses. The given claim is that the…

Q: researcher wants to test the claim that the average height of adult men in a certain population is…

A: To test the hypothesis, we'll use a one-sample t-test. The null hypothesis is that the population…

Q: A survey of 46 people was conducted to compare their self-reported height to their actual height.…

A: n=46,  Ho: μd=0.8  H1: μd>0.8 (claim)  sd=0.43, x̄d=1

Q: According to Facebook, the mean number of community pages, groups and events that users are…

A: Given that  Sample size n=64 Sample mean=86 Sample standard deviation =48