What is the p-value?
Q: An article in a journal reports that 31% of American fathers take no responsibility for child care.…
A: Given, Population proportion P=31%=0.31 Sample size of fathers n=235 Number o fathers who did not…
Q: A large nationwide survey showed that 65% of high school students like Coca-Cola better than Pepsi.…
A:
Q: A survey of 62 men found that 12 have a social media account. Another survey of 57 women found that…
A: Men are taken as group 1. Women are taken as group 2. Given: n1=62x1=12n2=57x2=40α=0.07
Q: Suppose a quarterback's completion percentage for the season is 67.2%. Based on relative frequency,…
A: We have to find Based on relative frequency, is it more likely that he will complete his next two…
Q: A survey of 78 men found that 10 have a social media account. Another survey of 51 women found that…
A: Given Information: Women: Sample size (n1) = 51 Out of which X1 = 26 have a social media account.…
Q: A study found that 80% of teenagers use social media on a regular basis. John wants to investigate…
A:
Q: Suppose a study reported that the average person watched 1.87 hours of television per day. A random…
A: Consider that μ is the population mean amount of television watched by the average person per day.
Q: A political analyst believes that a recent to support a in a senator's decision bill resulted drop…
A: Here, the claim is, senator’s recent decision to support a bill resulted in a drop of approval…
Q: A company has recently introduced a new hardware brand. The firm would like to estimate the…
A: From the given information, out of 150 randomly selected individuals from the target market segment,…
Q: Lecture(12.13): Researchers were investigating anxiety in first year college students.According to…
A: Given information: Going for a walk/ doing physical activity Listening to music/ watching a…
Q: The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the…
A: From the provided information, Sample size (n) = 250 She would now like to determine whether or not…
Q: imagine you’re hired by a beef company called “American Beef Makers” as a Data Analyst and you’re…
A: Please note that as per our guidelines if multiple sub-parts are there in a question we can answer…
Q: A survey of 800 randomly selected recent degree recipients found that 155 received associate…
A: Number og degree reciepents in the survey=800associate degrees recieved reciepents=155Bachelor…
Q: In a sample of 137 leopards selected randomly from one preserve, it is found that 7 of them have…
A: H0 : p = 0.13 H1: p ≠ 0.13
Q: A random sample of n1 = 148 people ages 16 to 19 were taken from the island of Oahu, Hawaii, and 14…
A: a) The level of significance, denoted by α, is defined as the probability of incorrectly rejecting…
Q: A statistical study is made to compare the % of smokers in small rural towns to the overall smoking…
A: Given Information:n=1500x=285c=95%=0.95
Q: One manufacturer claims that less than 6% of their fax machine is malfunctioning. In a random sample…
A:
Q: If a person has a z-score of –2.00, this would mean that they
A: If a person has a z-score of –2.00
Q: A random sample of n1 = 154 people ages 16 to 19 were taken from the island of Oahu, Hawaii, and 11…
A: The given data is as follows: For island of Oahu, The sample size n1 is 154 and the number of high…
Q: In a National Institute on Alcohol Abuse and Alcoholism survey, 33% of American adults said that…
A: Given: n= 2300 ,x= 805 p= 0.33 ,significance level(∝)= 95.0 p̂= 805 / 2300 =define hypothesis;-
Q: c. The test statistic (z v = (please show your answer to 3 decimal places.) d. The p-value = (Please…
A: We have to find test statistics and p value..
Q: An article reports that in a sample of 124 nurses, 51 said that a busy workload had a positive…
A:
Q: Suppose that Max is a climate change scientist and butterfly enthusiast. In Max's locale, the mean…
A: The distribution is normal and the population standard deviation is unknown so the t distribution…
Q: A sample of 9 freshmen takes a reading comprehension test and their scores are a mean of 10 and…
A: Consider that μ defines the population mean score.
Q: Labor day was created by the U.S. labor movement over 100 years ago. In a recent Gallop Poll, 1010…
A: Solution
Q: A pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…
A: It is given that margin of error (E) is 0.04 and the confidence level is 0.95.
Q: Find the value of the test statistic z using graphing calculator. The claim is that the proportion…
A:
Q: A Chinese cell-phone manufacturer exclusively uses robots in one of its factories. A random test run…
A:
Q: Suppose a marriage counselor believes that the proportion of married couples with three personality…
A: The provided information are:
Q: A random sample of n1 = 157 people ages 16 to 19 were taken from the island of Oahu, Hawaii, and 12…
A:
Q: Suppose you are conducting a paired t test to determine whether or not caffeine has an effect on…
A: d = B- A
Q: An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses…
A: Given that an adventure company runs two obstacle courses, Fundash and Coolsprint.For Fundash:,,…
Q: In a study of how depression may affect one's ability to survive a heart attack, the researchers…
A: Z TEST
The worldwide market share for a web browser was 20.5% in a recent month. Suppose that a sample of 200 random students at a certain university finds that 50 use the browser.
What is the p-value?
Here sample size is too large so use z test for proportion
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- A dietician read in a survey that 70.5% of adults in the U.S. do not eat breakfast at least 3 days a week. She believes that the proportion that skip breakfast 3 days a week is different than 0.705. To verify her claim, she selects a random sample of 71 adults and asks them how many days a week they skip breakfast.. 44 of them report that they skip breakfast at least 3 days a week. Test her claim at a = 0.10. The correct hypotheses would be: О Но:р 0.705 (claim) Но: р > 0.705 HA:p < 0.705 (claim) О Но: р — 0.705 HA:P + 0.705 (claim) Since the level of significance is 0.10 the critical value is 1.645 and -1.645 The test statistic is: (round to 3 places) The p-value is: (round to 3 places) The decision can be made to: O reject Ho O do not reject Ho The final conclusion is that: O There is enough evidence to reject the claim that the proportion that skip breakfast 3 days a week is different than 0.705. O There is not enough evidence to reject the claim that the proportion that skip…A random sample of n1 = 148 people ages 16 to 19 were taken from the island of Oahu, Hawaii, and 14 were found to be high school dropouts. Another random sample of n2 = 125 people ages 16 to 19 were taken from Sweetwater County, Wyoming, and 5 were found to be high school dropouts. Do these data indicate that the population proportion of high school dropouts on Oahu is different (either way) from that of Sweetwater County? Use a 1% level of significance.An LED light bulb manufacturer claims that the average lifespan of its 60-watt LED light bulbs is 27,000 hours. A corporate watchdog group is suspicious of the company's claim and thinks that the true average lifespan of the 60- watt LED light bulbs produced by the company may be less than the advertised 27,000 hours. The group collected and tested a random sample of 211 light bulbs and found the average lifespan of the sample was 26,941 hours. Use the p-value method to test the hypothesis that the mean lifespan of this brand of 60-watt LED light bulb is less than 27,000 hours, using a = 0.1. Assume the standard deviation of the lifespan of all such light bulbs is known to be 370 hours. State the null and alternative hypothesis for this test. Ho: ? H₁: ? Determine if this test is left-tailed, right-tailed, or two- tailed. right-tailed two-tailed left-tailed Should the standard normal (z) distribution or Student's (t) distribution be used for this test? The Student's t distribution…
- Consider a random sample of 300 students in a university, 75 of them declared that they like playing football. Compute a point estimate of the proportion of all students who would like to play football.A random sample of n1 = 157 people ages 16 to 19 were taken from the island of Oahu, Hawaii, and 12 were found to be high school dropouts. Another random sample of n2 = 129 people ages 16 to 19 were taken from Sweetwater County, Wyoming, and 6 were found to be high school dropouts. Do these data indicate that the population proportion of high school dropouts on Oahu is different (either way) from that of Sweetwater County? Use a 1% level of significance. (a) What is the level of significance? What is the value of the sample test statistic? (Test the difference p1 − p2. Do not use rounded values. Round your final answer to two decimal places.) (c) Find (or estimate) the P-value. (Round your answer to four decimal places.)A random sample of n1 = 148 people ages 16 to 19 were taken from the island of Oahu, Hawaii, and 14 were found to be high school dropouts. Another random sample of n2 = 125 people ages 16 to 19 were taken from Sweetwater County, Wyoming, and 5 were found to be high school dropouts. Do these data indicate that the population proportion of high school dropouts on Oahu is different (either way) from that of Sweetwater County? Use a 1% level of significance. I need help with sketching, (d) and (e)
- According to the Humane Society, 33% of households in the United States own at least one cat. You are interested in determining whether the proportion of households of the students at your school that own at least one cat is different from the national proportion. Suppose you survey an SRS of students at your school and find that 25% of them own cats, which yields a p-value of .092. Interpret this p-value.Management of a theater in a large city wants to know whether its popularity increased after it ran a popular musical. According to a previous study, 25% of city residents said they had been to the theater in the past year. A more recent study, conducted after the musical had run for a year, found that 156 of 536 residents sampled said they had been to the theater in the past year. Is there evidence at the ? = 0.05 level that the number of residents who have been to the theater has increased in the last year?On average, a sample of n = 36 scores will provide a better estimate of the population mean than a sample of n = 49 scores from the same population.
- Suppose that there is a 15% chance that a randomly selected Stat 240 student wears glasses. Out of a class with 35 students, what is the minimum number of students wearing glasses for the percent to be considered unusually high? Thanks!5t. A magazine reports that women trust recommendations from a particular social networking site more than recommendations from any other social network platform. But does trust in this social networking site differ by gender? The following sample data show the number of women and men who stated in a recent sample that they trust recommendations made on this particular social networking site. Women Men Sample 150 170 Trust RecommendationsMade on the social networking site 111 102 (a) What is the point estimate of the proportion of women who trust recommendations made on this particular social networking site? (b) What is the point estimate of the proportion of men who trust recommendations made on this particular social networking site? (c) Provide a 95% confidence interval estimate of the difference between the proportion of women and men who trust recommendations made on this particular social networking site. (Round your answers to four decimal places.)An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses suspects that the mean completion time of Fundash is not equal to the mean completion time of Coolsprint. To test this, she selects 240 Fundash runners and 200 Coolsprint runners. (Consider these as random samples of the Fundash and Coolspring runners.) The 240 Fundash runners complete the course with a mean time of 76.7 minutes and a standard deviation of 5.2 minutes. The 200 Coolsprint runners complete the course with a mean time of 77.5 minutes and a standard deviation of 5.4 minutes. Assume that the population standard deviations of the completion times can be estimated to be the sample standard deviations, since the samples that are used to compute them are quite large. At the 0.05 level of significance, is there enough evidence to support the claim that the mean completion time, μ1 , of Fundash is not equal to the mean completion time, μ2 , of Coolsprint?…