Research done in 2013 found that only 48% of all the site users reported getting their news aboutworld events on this site. A 2018 poll of 3625 randomly selected users of a social media sitefound that 1830 get most of their news about world events on the site.a. Does this sample give evidence that the proportion of site users who get their world news onthis site has changed since 2013? Carry out a hypothesis test and use a 0.05 significancelevel.b. After conducting the hypothesis test, a further question one might ask is what proportion ofall of the site users get most of their news about world events on the site in 2018. Use thesample data to construct a 95% confidence interval for the population proportion. How doesyour confidence interval support your hypothesis test conclusion?

The question is about hypothesis testing and confidence interval.Given :Population proportion of all…

Answered: Research done in 2013 found that only…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A random sample of 880 births included 426 boys. Use a 0.01 significance level to test the claim that 51.4% of newborn babies are boys. Do the results support the belief that 51.4% of newborn babies are boys?
A business student claims that the choice of flight class is independent of a personseducation level and would like to conduct their own hypothesis test. The student polled 360 people regarding their most recent flight. Conduct a chi-square test for independence at the 1%significance level. High School Degree Bachelors Masters Degree Degree or HigherEconomy 68 87 71First Class 43 25 66
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Suppose a poll is taken that shows that 281 out of 500 randomly selected, independent people believe the rich should pay more taxes than they do. Test the hypothesis that a majority (more than 50%) believe the rich should pay more taxes than they do. Use a significance level of 0.05.
Four scenarios of statistical studies are given below. Decide which study uses a population parameter. Answer O Lakeside Family Dentistry reported that 6 of the 15 patients who came in for a regular cleaning one day had at least one cavity. O As part of her senior project, Kaisa asked 84 of her classmates if they voted in the last presidential election. 39 said yes. O of 351 dog owners who were surveyed, 70 reported owning two dogs. The average finish time for the Ironman, Kona was 11:32 for the 1883 finishers, with an average swim time of 1:14, an average bike time time of 4:14.
A retailer believes that its new advertising strategy will increase sales. Previously, the mean spending in 15 categories of consumer items in both the 18–34 and 35+ age groups was $70.00. a) Formulate a hypothesis test to determine if the mean spending in these categories has statistically increased. b) After the new advertising campaign was launched, a marketing study found that the mean spending for 300 respondents in the 18–34 age group was $75.86, with a standard deviation of $50.90. Is there sufficient evidence to conclude that the advertising strategy significantly increased sales in this age group? c)The marketing study also determined that for 700 respondents in the 35+ age group, the mean and standard deviation were $68.53 and $45.29, respectively. Is there sufficient evidence to conclude that the advertising strategy significantly increased sales in this age group?
An author argues that more American-born baseball players have birth dates in the months immediately following July 31 because that was the age cutoff date for nonschool baseball leagues. The table below lists months of births for a sample of American-born baseball players and foreign-born baseball players. Using a 0.01 significance level, is there sufficient evidence to warrant rejection of the claim that months of births of baseball players are independent of whether they are born in America? Do the data appear to support the author's claim? a. Identify the test statistic. (Round to three decimal places as needed.) b. Identify the P-value. (Round to three decimal places as needed.)
Provide an appropriate response. 1) A local supermarket claims that the waiting time for its customers to be served is the lowest in the area. A competitor's supermarket checks the waiting times at both supermarkets. The sample statistics are listed below. Test the local supermarket's hypothesis. Use a = 0.05. Local Supermarket n1 = 15 Competitor Supermarket n2 = 16 x2 = 5.6 minutes s2 = 1.0 minutes x1 = 5.3 minutes s1 = 1.1 minutes
A hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. When evaluated using the 5% level of significance, what is the decision and interpretation of the null hypothesis? Show all steps.
The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.
A newspaper published an article about a study in which researchers subjected laboratory gloves to stress. Among 235 vinyl gloves, 56% leaked viruses. Among 235 latex gloves, 15% leaked viruses. Using the accompanying display of the technology results, and using a 0.01 significance level, test the claim that vinyl gloves have a greater virus leak rate than latex gloves. Let vinyl gloves be population 1. Click the icon to view the technology results. atcrunch 2 What are the null and alternative hypotheses? W S I OA. Ho: P1 P2 H₁: P₁ P2 OD. Ho: P1 P2 H₁: P₁ P2 Identify the test statistic. X (Round to two decimal places as needed.) Identify the P-value. Tech help ommand H Round to three darimal nlaces as nearleri 1 # 3 80 A E $ 288 D el с R F % 5 V T G OB. Ho: P1 P2 H₁: P₁ P2 OE. Ho: P1 P2 H₁: P₁ P2 MacBook Air B Y & 7 H 3 N *** 8 J M K OC. Ho: P1 P2 H₁: P₁ =P2 OF. Ho: P1 #P2 H₁: P1 P2 O L H P command Next alt option
Portland State University (PSU) reported that 64% of their students receive financial aid. A PSU administrator feels that their school may have a different proportion compared to all of Oregon schools. A random sample of 409 students in Oregon found that 259 receive financial aid. Test the claim that proportion of students that receive financial aid in Oregon is different than PSU. Use a 1% significance level. Give answer to at least 4 decimal places. a. What are the correct hypotheses? (Select the correct symbols and use decimal values not percentages.) Ho: Select an answer ?v H₁: Select an answer ? ✓ Based on the hypotheses, compute the following: b. Test Statistic = c. p-value = d. Based on the above we choose to Select an answer e. The correct summary would be: Select an answer that the proportion of students that receive financial aid in Oregon is different than the PSU reported value of 64%.

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