The consumer board’s alternative hypothesis is:
Q: The authors of a certain paper describe a study to evaluate the effect of mobile phone use by taxi…
A: The objective of the question is to understand the statistical data provided in the study. The data…
Q: 0.10
A: Given Information: The null and alternative hypotheses are: H0:μ=243Ha:μ>243
Q: Two machines are used to fill plastic bottles with dishwashing detergent. The standard deviations…
A: a. Hypotheses for the test are given below:
Q: Ho: μ = Ha: Select an answer α= P-value = Based on the above we choose Question Help: Post to foru…
A: Given that, Hypothesized Population Mean (µ) = 48722 The provided sample mean is X = 49870…
Q: ed in the US from 1968 to 2008. Suppose that the daily high temperature reading on January 1 was…
A: SE=sn=4.7548=0.6856
Q: In this problem, we consider a small set of evidence for global warming by comparing how…
A: Given: d=1.15,SDd=4.25,n=54
Q: A company is interested in understanding if there is a significant difference in the average time it…
A: For call center A, The sample size is The sample mean is The sample standard deviation is For call…
Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…
A: State the null and alternative hypotheses for the test. Fill in the blank below. H0: μ=6:…
Q: You are the manager of a local bakery, and are looking to investigate if you should add a new pie to…
A: Given that Sample size n =19 Sample mean =360.43 Sample standard deviation =102.61
Q: there sufficient evidence at a=0.01 to conclude that their health care expenditure differs from the…
A:
Q: A major orange juice producer buys their supply of oranges from a large orange grove in Southern…
A: The question is about normal distribution.Given :Population mean amount orange juice ( ) = 4.70…
Q: The owner of the small convenience store in the previous question sells two different candy brands.…
A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…
Q: Determine the decision rule for rejecting the null hypothesis H0H0. Round the numerical portion of…
A: Given that Sample sizes n1=70 , n2=85 Sample means X̄1=8.84 , X̄2=9.05 ?1 =0.30…
Q: The average gasoline price of one of the major oil companies has been S2.20 per gallon. Because of…
A:
Q: A medical researcher administers a new medication to a random sample of 70 flu sufferers, and she…
A: From the provided information, The degree of freedom = n1 + n2 – 2 = 70 + 50 – 2 = 118 As, the…
Q: The average gasoline price of one of the major oil companies has been $2.20 per gallon.because of…
A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…
Q: 5. Suppose a tire company developed two new brands of tires and would like to compare the…
A: Suppose a tire company developed two new brands of tires and would like to compare the variability…
Q: 3. To determine whether chocolate or vanilla ice cream is more popular, the owner of the Zootie ice…
A:
Q: 5. Suppose a tire company developed two new brands of tires and would like to compare the…
A: sample size 1 ,n1 = 30 Degree of freedom 1,df1= 29 sample variance 1,s1= 3700.0…
Q: The average gasoline price of one of the major oil companies has been $2.30 per gallon. Because of…
A: Mean()=2.21standard deviation()=0.17sample size(n)=36
Q: Workers employed in a large service industry have an average wage of $15.00 per hour with astandard…
A: Solution: Given information: n= 64 Sample size of workers x=12.50 Sample meanμ=$15.00 Population…
Q: If n-31, (x-bar)=40, and s-5, construct a confidence interval at a 98% confidence level. Assume the…
A: Given that Sample Mean \bar XXˉ = 4040 Sample Standard Deviation (s)(s) = 55 Sample Size…
Q: Suppose a tire company developed two new brands of tires and would like to compare the variability…
A: a. The variance of mile covers by tire of Brand 1 is σ12 and the variance of mile covers by tire of…
Q: An ecologist is examining whether the number of fish caught in a large river basin has changed since…
A:
Q: A researcher is interested in examining the difference in the average egg incubation temperature of…
A: Given, The average incubation temperature for the 25 sampled brown anoles is 83.2 degrees…
Q: Suppose a random sample of 25 individuals is taken and that average annual salary for that sample is…
A: From the given information, Sample size (n) =25 x=54000s=12000 Since, population standard…
Q: In a random sample of 6 cell phones, the mean full retail price was $541.20 and the standard…
A: The given data is as follows:Sample size, Sample mean, Sample standard deviation, Population mean,
Q: data per second passes between a consumer's computer and the internet. As of August of 2012, the…
A: Given data : sample size, n = 15 population standard deviation,σ= 12.2 sample…
Q: Students at a major university are complaining of a serious housing crunch. Many of the university’s…
A: A. Suppose X is a random variable with expectation, μ and standard deviation, σ. Then, for any…
Q: A test has been developed to measure the attitudes of executives of a large company towards…
A: For male:The sample size, ; The sample mean, ; The sample standard deviation, .For female:
Q: You are interested in testing whether the average age of household heads is higher in the suburbs…
A: Given: For sample 1 (the household heads): Sample size (n1)=45Sample mean(x¯1)=44Standard deviation…
Q: Consider two populations in the same state. Both populations are the same size (22,000). Population…
A: The following solution is provided below :
Q: Insurance Company A claims that its customers pay less for car insurance, on average than customers…
A: Formula : test statistic for equal variance t test is
Q: According to the College Board, scores on the math section of the SAT Reasoning college entrance…
A: Given information, Mean =516 Standard deviation =116
A producer advertises that the average shelf life of canned fruit produced by his firm is at least 12 months. The consumer board disagrees, and claims that the average shelf life of the canned fruit is less than 12 months. Consider a random sample of nine cans of fruit with a mean shelf life of 10.6 months and a standard deviation of 2 months. The consumer board’s alternative hypothesis is:
A. The average shelf life of canned fruit is 12 months
B. The average shelf life of canned fruit is more than 12 months
C. The average shelf life of canned fruit is at least 12 months
D. The average shelf life of canned fruit is less than 12 months
E. None of the preceding
Step by step
Solved in 2 steps with 1 images
- Justine is an analyst for a sleep study center. She believes that the average adult in a certain city spends more than 7.2 hours sleeping daily. To test this claim, she selects a random sample of 63 adults from the city. The following is the data from this study: The alternative hypothesis Ha:μ>7.2. The sample mean number of hours slept per night by the 63 adults is 7.52 hours. The sample standard deviation is 1.14 hours. The test statistic is calculated as 2.23. Using the information above and the portion of the t− table below, choose the correct p− value and interpretation for this hypothesis test. Values for right-tail areas under the t-distribution curve Probability 0.10 0.05 0.025 0.01 0.005 Degrees of Freedom 60 1.296 1.671 2.000 2.390 2.660 61 1.296 1.670 2.000 2.389 2.659 62 1.295 1.670 1.999 2.388 2.657 63 1.295 1.669 1.998 2.387 2.656 64 1.295 1.669 1.998 2.386 2.655 65 1.295 1.669 1.997 2.385 2.654 66 1.295 1.668 1.997 2.384 2.652…A regional airline serving Las Vegas has a base airfare rate of $99. In addition, various fees are charged: for checked baggage, refreshments/drinks in-flight, and for making a reservation on its website. These additional charges average $70 per passenger. Suppose a random sample of 59 passengers is taken to determine the total cost of their flight. The population standard deviation of total flight cost is known to be $40. (a) What is the population mean cost per flight in dollars? $ (b) What is the probability the sample mean will be within $10 of the population mean cost per flight? (Round your answer to four decimal places.) (c) What is the probability the sample mean will be within $5 of the population mean cost per flight? (Round your answer to four decimal places.)A random sample of 89 tourists in British Columbia showed that they spent an average of $2860 (in a week) with an assumed population standard deviation of $126; and a sample of 64 tourists in Alberta showed that they spent an average of $2935 (in a week) with an assumed population standard deviation of $138. We are interested in determining if there is any significant difference between the average expenditures of all the tourists who visited the two provinces.a. At a significance level of 0.05, are the two average expenditures significantly different? b. Calculate the 99% confidence interval and interpret your results?
- You are interested in testing whether the average age of household heads is higher in the suburbs than in inner city neighbourhoods. A survey is conducted, and the following results are obtained. In the suburbs, the household heads of the 45 households surveyed had a mean age of 44 with a standard deviation of 15. In the inner city, the mean age of the 40 household heads surveyed was 38 with a standard deviation of 13. Assuming that the populations from which these samples were drawn have equal variances, can you conclude that the difference between the two means is significant at the 95% level of confidence? (a) Write in words and symbols the null and research hypotheses. (b) Assuming the variances of the populations are equal, calculate the value of the Pooled Variance Estimate (PVE). (c) Calculate the value of the standard error for the difference between the two means.In a sample of 80 business trips taken by employees in the HR department, a company finds that the average amount spent for the trips was $1580 with a standard deviation of $350. In a sample of 80 trips taken by the employees in the sales department is $1750 with a standard deviation of $550. When testing the hypothesis that the averageamount spent on trips taken by the salesepartment are higher than those taken by the HR department, if the test statistic is 2.33 and the critical value is 1.96 then what is your conclusion concerning the null hypothesis? Reject the null hypothesis Fail to reject the null hypothesisA report states that the mean yearly salary offer for students graduating with a degree in accounting is $48,722. Suppose that a random sample of 50 accounting graduates at a large university who received job offers resulted in a mean offer of $49,870 and a standard deviation of $3900. Do the sample data provide strong support for the claim that the mean salary offer for accounting graduates of this university is higher than the national average of $48,722? Ho: μ = Ha: (Put in the correct symbol and value) ✓ Select an answer a not = P-value: = ↑ Based on the above we choose to Select an answer Question Help: Post to forum Submit Question
- The mean tar content of a simple random sample of 25 unfiltered king-size cigarettes is 21.4 mg, with a standard deviation of 3 mg. The mean tar content of a simple random sample of 25 filtered 100-mm cigarettes is 13.0 mg with a standard deviation of 3.8 mg. The accompanying table shows the data. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Let population 1 be unfiltered king-size cigarettes. Complete parts (a) through (c) below. Click the icon to view the data. a. Use a 0.05 significance level to test the claim that unfiltered king-size cigarettes have a mean tar content greater than that of filtered 100-mm cigarettes. What does the result suggest about the effectiveness of cigarette filters? Identify the null and alternative hypotheses. O B. Ho: H1 =H2 O C. Ho: H1 #H2 H1: H1 =H2 O A. Ho: H1 = H2 H:H1 H2 O F. Ho: H1 = H2 H1:H1> H2 H:H1=H2 Hq: H1…A triathlon consisting of swimming, cycling, and running is one of the more strenuous amateur sporting events. An article reports on a research study involving nine male triathletes. Maximum heart rate (beats/min) was recorded during performance of each of the three events. For swimming, the sample mean and sample standard deviation were 187.0 and 7.2, respectively. Assuming that the heart-rate distribution is (approximately) normal, construct a 98% CI for true mean heart rate of triathletes while swimming. (Round your answers to one decimal place.) USE SALT beats/min You may need to use the appropriate table in the Appendix of Tables to answer this question.A manufacturer advertises that the average life of batteries produced by his firm is at least 12 months. The consumer board disagrees, and claims that the average life of the batteries is less than 12 months. The consumer board test a random sample of 9 batteries and find that the mean life is 10.6 months with a standard deviation of 2. The consumer board's alternative hypothesis is: A. The average life of the population of batteries is 12 months. B. The average life of the population of batteries is less than 12 months. C. The average life of the population of batteries is more than 12 months. D. The average life of the population of batteries is at least 12 monthsThe manufacturer of 'Road King' tyres claim that their tyres last an average of 70,000km or more. The Consumer Board suspects that this claim may be false (they have received some complaints) and decide to test the manufacturer's claim. The Consumer Board took a sample of size 500 from the population. They ran the…
- A study was conducted for an aviation safety agency in which they surveyed thousands of passengers at airports across Europe. In this study, the "mass" for a passenger includes the weight of the passenger and all of the passenger's carry-on items, including infants without their own seats. For the 5,904 adult male passengers measured in summer, the sample mean and standard deviation for this mass were 88.8 kg and 15.9 kg, respectively. (a) Construct a 95% confidence interval (in kilograms) for the population mean mass for adult male passengers in summer. (Round your answers to three decimal places.) ___to__ kg (b) Write a sentence or two interpreting the confidence interval you found in part (a). With 95% confidence, we can estimate that the population mean mass of male passengers traveling in the summer is contained within the interval. We can estimate that 95% of the male passengers traveling in the summer in the sample have a mass that is contained within the interval.…Consider the following service system. The average inter-arrival time is 10 minutes, and the standard deviation of the inter-arrival time is 10 minutes. The average processing time is 5 minutes with the standard deviation of the processing time being 6 minutes. What is the value of Iq? What is the value of I?A food distribution company claims that a restaurant chain receives, on average, 26 pounds of fresh vegetables on a daily basis. The standard deviation of these shipments is known to be 4.4 pounds. The district manager of the restaurant chain decides to randomly sample 35 shipments from the company and finds a mean weight of 24.7 pounds. Test at a 3% level of significance to determine whether or not the food distribution company sends less than 26 pounds of fresh vegetables. a. Check the TWO requirements that are satisfied. The Central Limit Theorem applies. The a distribution is normal since n > 30. The a distribution is normal since the x distribution is normal. The p distribution is normal since np > 5 and nq > 5.
