A cigarette-manufacturing firm distributes two brands of cigarettes. If it is found that 56 of 200 smokers prefer brand A and 29 of 150 smokers prefer brand B, can we conclude at the .05 level of significance that brand A outsells brand B?
Q: A reporter claims that less than one in four Americans believe that Facebook acted inappropriately…
A: H0 : p =1/4 = 0.25 H1 : p <0.25
Q: Construct and interpret 95% confidence interval for the difference in oxygen levels before and after…
A: Answer:
Q: A marriage counselor has traditionally seen that the proportion p of all married couples for…
A:
Q: A marriage counselor has traditionally seen that the proportion p of all married couples for…
A:
Q: To test the fairness of law enforcement in its area, a local citizens' group wants to know whether…
A: Here We have write the null and alternative hypothesis
Q: A marriage counselor has traditionally seen that the proportion p of all married couples for whom…
A: From the provided information, Sample size (n) = 245 From which 189 of them stayed together. Sample…
Q: It is believed that the proportion of the boys getting placed trough campus recruitment is higher…
A: We have given thatn1 = 670 , x1 = 320n2 = 630 , x2 = 280Significance level (α) = 0.05Now,p̂1 = x1/n1…
Q: To test the fairness of law enforcement in its area, a local citizens' group wants to know whether…
A:
Q: A marriage counselor has traditionally seen that the proportion p of all married couples for whom…
A: Given data issample size(n)=205x=164sample proportion(p^)=xn=164205=0.8significance level(α)=0.05
Q: According to a report done by S & J Power, the mean lifetime of the light bulbs it manufactures is…
A: Since you have posted multiple questions we will provide the solution onlyto the first question as…
Q: A researcher is interested in determining if the proportion of children that collect specific types…
A: The given information is that the proportions of children, 36% of them collect Legos, 19% of them…
Q: A marriage counselor has traditionally seen that the proportion p of all married couples for whom…
A: From the provided information,Sample size (n) = 210From which 167 of them stayed together.Level of…
Q: In one study of smokers who tried to quit smoking with nicotine patch therapy, 39 were smoking one…
A: The information provided in the question is as follows :-Number of people who were smoking after the…
Q: The manufacturer of a gasoline dditive claims that the use of this additive increase gasoline…
A: Solution: Let x = miles per gallon without additive and y = miles per gallon with additive.…
Q: A marriage counselor has traditionally seen that the proportion p of all married couples for whom…
A:
Q: A large food distributor claims that 45% of all individuals who purchase eggs from its grocery…
A: The data on egg purchases is provided as follows:Egg typeClaim PercentageSample number of…
Q: A researcher thinks that watching violent televisions increases aggressive behavior in children. To…
A: Given 48 children 3 groups
Q: A marriage counselor has traditionally seen that the proportion p of all married couples for whom…
A: The proportion, p, of all married couples for whom the communication program can prevent divorce, is…
Q: To test the fairness of law enforcement in its area, a local citizens’ group wants to know whether…
A: Given Information: Ticketed Not Ticketed Men 35 144 Women 22 199
Q: To test the fairness of law enforcement in its area, a local citizens’ group wants to know whether…
A: The significance level, α=0.02 The given data is, Ticketed Not Ticketed Men 19 74 Women 11…
Q: A marriage counselor has traditionally seen that the proportion p of all married couples for whom…
A: given data clim : p > 0.76n = 215x = 171α = 0.05p^ = xn = 171215 = 0.7953
Q: A marriage counselor has traditionally seen that the proportion p of all married couples for whom…
A: Note:- Since you have posted a question with multiple subparts, we will provide the solution only to…
Q: Q.23 Consider a drug that is used to help prevent blood clots in certain patients. In clinical…
A: Sample size, n=5991 No. of patients with adverse reaction of nausea, x=153 α=0.01
Q: To test the fairness of law enforcement in its area, a local citizens’ group wants to know whether…
A:
Q: A Gallup poll to survey the top concerns of Americans was conducted. Suppose that 725725 women and…
A:
Q: 9. 100 Baseball fans from 4 regions of the country were asked about their opinion of the hew…
A: The chi-square test of independence is used to test whether two categorical variables are…
Q: In a previous Paul, 44% of adults with children under the age of 18 reported that their family ate…
A: 44% of the adults with children under the age of 18 reported that their family ate dinner together…
Q: 1. A study was performed investigating the relationship between Gender and Left- or Right-…
A: Claim : The handedness is independent of Gender. Hypothesis : H0 : The handedness is independent of…
Q: To test the fairness of law enforcement in its area, a local citizens’ group wants to know whether…
A: Answer Sample size [n1] =28+152 =180 sample size [n2] =20+200 =220 X1 =28 x2=20 sample proportion1…
Q: Rock-paper-scissors is a hand game played by two or more people where players choose to sign either…
A: The null and alternative hypotheses are: H0: The distribution is uniform. H1: The distribution is…
Q: 5. Help for Insomniacs. In Exercise 1.23, we learned of a study to determine whether just one…
A: No. of people diagnosed with insomniaThere are group divisions of each by random selection. group…
Q: A market research company asked 9 people to evaluate a brand of tablet computer, Brand A, using a…
A: Given: Data for brand A: Information for brand B:
Q: (a) State the null hypothesis Ho and the alternative hypothesis H₁. H:0 H₁:0 (b) Determine the type…
A: It is given that Population proportion, p = 80% = 0.80 Favourable cases, X = 178 Sample size, n =…
Q: When you get a surprisingly low price on a product do you assume that you got a really good deal or…
A: a. Let μd is defined as the population mean difference between purchased by a friend or purchased…
Q: A report described a survey of parents of children under the age of 18. Each person in a…
A: According to the given information in this question, we need to construct 95% confidence interval
Q: A marriage counselor has traditionally seen that the proportion p of all married couples for whom…
A: Given that Sample size n =205 Favorable cases x =171 Sample proportion p^=x/n =171/205 =0.8341
Q: It is believed that, due to the ages in which children are enrolled in schools, certain children…
A:
Q: ΑΤΑ statistics thinks that the for of the conferences and the timing of the assignments may affect…
A: Here, we have to perform ANOVA test and then conclude results from the test.
Q: Rock-paper-scissors: Rock-paper-scissors is a hand game played by two or more people where players…
A: Hypotheses information. The null and alternative hypotheses are as follows; Ho: The distribution is…
Q: To test the fairness of law enforcement in its area, a local citizens' group wants to know whether…
A:
Q: 6.43 Rock-paper-scissors: Rock-paper-scissors is a hand game played by two or more people where…
A: Consider that pi’s are the proportion of players who choose rock, paper and scissors respectively…
A cigarette-manufacturing firm distributes two brands of cigarettes. If it is found that 56 of 200 smokers prefer brand A and 29 of 150 smokers prefer brand B, can we conclude at the .05 level of significance that brand A outsells brand B?
Step by step
Solved in 2 steps with 1 images
- A marriage counselor has traditionally seen that the proportion p of all married couples for whom her communication program can prevent divorce is 80%. After making some recent changes, the marriage counselor now claims that her program can prevent divorce in more than 80% of married couples. In a random sample of 215 married couples who completed her program, 180 of them stayed together. Based on this sample, is there enough evidence to support the marriage counselor’s claim at the 0.05 level of significance? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. A. State the null hypothesis Hoand the alternative hypothesis H1. Ho: H1: B. Find the value of the test statistic. (Round to three or more decimal places.) C. Find the critical value. (Round to three or more decimal places.) D. Is there enough evidence to support the marriage counselor's claim that the proportion of married couples for whom her program…To investigate the effect of price on toaster sales, a chain of department stores decided to raise the price of a certain brand of toaster in 20 randomly selected stores (Sample A) and to lower the price in 10 randomly selected stores (Sample B). Monthly revenue (number sales x sales price) from these toasters was recorded for each of the 30 stores. Results from the two samples are as follows: No. of stores Мean Std. Dev. Sample A Sample B $842 $817 $217 $202 20 10 If you considered these to be independent samples, what would be the pooled estimate of the standard deviation for revenue? Calculate a 95% confidence interval for the difference between (а) (b) the two means.A marriage counselor has traditionally seen that the proportion p of all married couples for whom her communication program can prevent divorce is 79%. After making some recent changes, the marriage counselor now claims that her program can prevent divorce in more than 79% of married couples. In a random sample of 250 married couples who completed her program, 205 of them stayed together. Based on this sample, is there enough evidence to support the marriage counselor's claim at the 0.05 level of significance? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. (If necessary, consult a list of formulas.) (a) State the null hypothesis H and the alternative hypothesis H₁. H₂ : D H₁ : 0 (b) Determine the type of test statistic to use. (Choose one) (c) Find the value of the test statistic. (Round to three or more decimal places.) 0 (d) Find the p-value. (Round to three or more decimal places.) 0 (e) Is there enough…
- A marriage counselor has traditionally seen that the proportion p of all married couples for whom her communication program can prevent divorce is 77%. After making some recent changes, the marriage counselor now claims that her program can prevent divorce in more than 77% of married couples. In a random sample of 215 married couples who completed her program, 167 of them stayed together. Based on this sample, is there enough evidence to support the marriage counselor’s claim at the 0.10 level of significance? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. (If necessary, consult a list of formulas.) (a) State the null hypothesis H0 and the alternative hypothesis H1. H0: H1: (b) Determine the type of test statistic to use. ▼(Choose one) (c) Find the value of the test statistic. (Round to three or more decimal places.) (d) Find the p-value. (Round to three…To test the fairness of law enforcement in its area, a local citizens’ group wants to know whether women and men are unequally likely to get speeding tickets. Three hundred randomly selected adults were phoned and asked whether or not they had been cited for speeding in the last year. Using the results in the following table and a 0.02 level of significance, test the claim of the citizens’ group. Let men be Population 1 and let women be Population 2. Ticketed Not Ticketed Men 14 165 Women 22 99 Step 1 of 3: State the null and alternative hypotheses for the test Step 2 of 3: Compute the value of the test statistic. Round your answer to two decimal places. Step 3 of 3: Draw a conclusion and interpret the decision.2. A study performed in 2010 found that 4% of people with asthma have aspirin sensitivity. A hospital suspects that the percentage may actually be higher and tests a random sample of 310 asthma patients in controlled conditions. The hospital found that 20 out of the 310 asthma patients they tested had aspirin sensitivity. At the 0.05 significance level, test the claim that more than 4% of all asthma patients have aspirin sensitivity. a. State the i. Claim in words ii. Express the claim mathematically iii. What is the Null Hypothesis iv. What is the Alternative Hypothesis b. Which test procedure is appropriate to perform the required hypothesis test? c) Compute the value of the test statistic. d) What is the P-Value. Please round your P -value to three decimal places. P-Value = e) Should you reject the null hypotheses or not? f) What is your conclusion about the hypothesis test?
- The Substance Abuse and Mental Health Services Administration (SAMHSA, 2017) estimates that 10.9% of the population of the United States age 18–24 had an episode of depression in the previous 12 months. Suppose a researcher takes a random sample of 225 United States adults aged 18–24. Determine the value of the sample proportion, p, such that 5% of samples of 225 United States adults age 18–24 are greater than p. You may find software or a z-table useful. Give your answer precise to three decimal places. p = IIThe milk yield from two breeds of goats, A and B, is categorised as low, medium or high. One hundred goats in a random sample are classified according to breed and milk yield. The results are summarised in the table below. i. Explain the difference between a test of independence and a test of homogeneity ii. Perform a chi squared test, at the 95% of significance level, to determine whether there is an association between the breed of goats and the milk yield.OA. Ho: Px-Py = 0 H₁: Px-Py ≤0 Small-business telephone users were surveyed 6 months after access to carriers other than Carrier A became available for wide-area telephone service. Of a random sample of 280 Carrier A users, 145 said they were attempting to learn more about their options, as did 152 of an independent random sample of 220 users of alternate carriers. Test, at the 5% significance level against a two-sided alternative, the null hypothesis that the two population proportions are the same. O D. Ho: Px-Py #0 H₁: Px-Py = 0 O B. Ho: Px-Py = 0 H₁: Px - Py#0 The test statistic is Z = (Round to two decimal places as needed.) The critical value(s) is (are). (Round to two decimal places as needed. Use a comma to separate answers as needed.) Since the test statistic is than the critical value(s), O E. Ho: Px - Py = 0 H₁: Px - Py> 0 reject Ho Ho. There is do not reject Ho- insufficient OC. Ho: Px-Py = 0 H₁: Px-Py <0 ▾ evidence to conclude that there is a difference between the two…
- 2. A principal of high school was concerned with amount of time her students devote to working at after-school jobs. She randomly selected 25 students, obtained their working hours for 1 week and computed x = 12.5 hours and s = 4.5 hours. She claims that her students work significantly more than the mean of 10.7 hours from a study conducted by the National Association of State High School Association. Test her claim by using the 5% level of significance.2A marriage counselor has traditionally seen that the proportion p of all married couples for whom her communication program can prevent divorce is 75%. After making some recent changes, the marriage counselor now claims that her program can prevent divorce in more than 75% of married couples. In a random sample of 245 married couples who completed her program, 185 of them stayed together. Based on this sample, is there enough evidence to support the marriage counselor's claim at the 0.01 level of significance? (a) State the null hypothesis Ho and the alternative hypothesis H₁. Ho Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. (If necessary, consult a list of formulas.) H₁ (b) Determine the type of test statistic to use. (Choose one) ▼ (c) Find the value of the test statistic. (Round to three or more decimal places.) 0 (d) Find the p-value. (Round to three or more decimal places.) (e) Is there enough…