A Z-test for single population mean is conducted with Ha: µ < 10, at significance level of 0.05, The most significant result is suggested by the following test statistic O -1.65 O2.2 4.7 O 1.96 O3.7 O -4.5
Q: In a simple random sample of 46 oral temperatures, the mean was 37.3 degrees Celsius with a standard…
A: It is given that n=46, df=45, x=37.3 and s=1.1. The test isH0:μ=37H1:μ>37
Q: mean lung capacity for nonsmoking males in the population aged 50 is 2.2 liters. an investigator…
A: Given that The mean lung capacity for nonsmoking males in the population aged 50 is 2.2 liters =…
Q: For this study, we should use The null and alternative hypotheses would be: H0:H0:…
A: Given data : 66, 57, 60, 76, 66, 75, 61, 64, 76, 68, 70
Q: What is the value of the test statistic? Paired t-test
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A: We have to find answers from given screen
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A: Hypothesis test consist of two statements, they are null and alternate hypothesis. Null hypothesis…
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Q: In tests of a computer component, it is found that the mean time between failures is 917 hours. A…
A: Solution-: Given: μ0=917,σ=57,x¯=963,n=25,α=0.01 We want to perform a hypothesis test to determine…
Q: For an upper-tail test at the 1% significance level, what is the appropriate critical value when a…
A: When the sample of small size is drawn from a normal population with unknown SD, the we use critical…
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A:
Q: In the article "Experimental Measurement of the Stopping Performance of a Tractor- Semitrailer from…
A: Given data 32.1, 30.6, 31.4, 30.4, 31.0, 31.9
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A:
Q: A researcher wishes to determine whether the blood pressure of vegetarians is, on average, lower…
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Q: To find the impact of students working while enrolled in classes, a researcher carried out a survey…
A: X be the students working hours. X follows Normal distribution with mean μ and the standard…
Q: A simple random sample of 101 course evaluations had a mean x = 3.90 with a standard deviation s =…
A: Given Information: Sample size (n) = 101 Sample mean (x¯) = 3.90 Sample standard deviation (s) =…
Q: Is there a difference between urban and rural jurisdictions in the hiring of female police officers?…
A: Given: n1 = 77 X1 = 9.65 Sum of squares of deviations SS1 = 1321.56 X2 = 6.8 n2 = 84 Sum of squares…
Q: A poll used a sample of 100 randomly selected car owners. Within the sample, the mean time of…
A: Answer Mean =5.54Sample size =100Standard deviation =3.39Use a 0.05 significance level.
Q: In a test of weight loss programs, 186 subjects were divided such that 31 subjects followed each of…
A: From the provided information, Level of significance (α) = 0.025 Source of variation SS df…
Q: In tests of a computer component, it is found that the mean time between failures is 920 hours. A…
A: Solution: Given information: n= 36 Sample size x= 966 hours Sample mean μ=920 hours Population…
Q: A home improvement company is interested in improving customer satisfaction rate from the 55%…
A: From the provided information,Sample size (n) = 240From which 147 customers were satisfied. Sample…
Q: In a test of weight loss programs, 175 subjects were divided such that 35 subjects followed each of…
A: Given, Level of significance = 0.025 p-value = 0.005949
Q: Determine the critical values for a two tailed test of a population mean at the a=0.01 level of…
A: The test is of a population mean. The sample size is 29.That is sample size is less than 30 for this…
Q: The height of women ages 20-29 is normally distributed, with a mean of 64.6 inches. Assume sigma =…
A: From the provided information, Mean (µ) = 64.6 inches Standard deviation (σ) = 2.8 inches X~N (64.6,…
Q: In a study of distances traveled by buses before the first major engine failure, a sample of 191…
A: From the given information, Sample size n =191 the Sample mean, x̅ =96,700 the Sample standard…
Q: The shareholders group claimed that the mean tenure for a chief executive office (CEO) was less than…
A: Denote μ as the true average tenure of chief executive office. It is needed to check, whether the…
Q: To find the impact of students working while enrolled in classes, a researcher carried out a survey…
A:
Q: Two students collected data on random baseball player run-times. Players were required to run 50…
A: Given that two students collected data on random baseball player run times. Using the data we have…
Q: The average number of miles a person drives per day is 30. A researcher wishes to see if people over…
A: z-test should be performed. Null and alternative hypothesis is: H0:μ=30Hα:μ<30
Q: Is narcissism a more common personality trait today than it was a few decades ago? It is known that…
A: From the provided information, Sample size (n) = 25 Mean (M) = 16.5 Sample standard deviation (s) =…
Q: A random survey was done at a small college, and the students were asked how many hours a week they…
A: Given data: Significance level = 0.05
Q: The following is the ANOVA data obtained from a balanced CRD: ANOVA: Source of Variation Degree of…
A: Given Level of significance=0.01,dferror=20, dftotal=42
Q: The average annual miles driven per vehicle in the United States is 11.1 thousand miles, with o =…
A:
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- A manager of a pizza restaurant has changed the restaurant's delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 30 minutes. A sample of 49 orders using the new delivery process yields a sample mean of 27.8 minutes and a sample standard deviation of 5 minutes. Complete parts (a) through (d) below. a. Using the critical value approach, at the 0.01 level of significance, is there evidence that the population mean delivery time has been reduced below the previous population mean value of 30 minutes? State the null and alternative hypotheses for this test. O A. Ho: H5 30 H: u> 30 Ο Β . Ho: με 27.8 O c. H μ2 30 H: u 30 OF. Ho: H 27.8 H,: us 30 H,: µ2 30 What is the test statistic for this test? ISTAT =O (Type an integer or a decimal. Round to two decimal places as needed.) What is(are) the critical value(s) for this test? (Type an integer or a decimal. Round to two decimal places as needed. Use commas to separate your answers…8. 140 migrating pigeons were caught by a biologist for data collection. The mass of these pigeons is normally distributed with mean 0.9 kg and standard deviation of deviation 0.15 kg. a) Determine the percentile rank of a pigeon weighing 1kg. b) What proportions of pigeons have weight greater than 1.1 kg or less than 0.7 Kg 31Bone mineral density (BMD) is a measure of bone strength. Studies show that BMD declines after age 45. The impact of exercise may increase BMD. A random sample of 59 women between the ages of 41 and 45 with no major health problems were studied. The women were classified into one of two groups based upon their level of exercise activity: walking women and sedentary women. The 39 women who walked regularly had a mean BMD of 5.96 with a standard deviation of 1.22. The 20 women who are sedentary had a mean BMD of 4.41 with a standard deviation of 1.02. Which of the following inference procedures could be used to estimate the difference in the mean BMD for these two types of women
- In its Fuel Economy Guide for 2016 model vehicles, the Environmental Protection Agency provides data on 11701170 vehicles. There are a number of high outliers, mainly hybrid gas‑electric vehicles. If we ignore the vehicles identified as outliers, however, the combined city and highway gas mileage of the other 11461146 vehicles is approximately Normal with mean 23.0 miles per gallon (mpg) and standard deviation 4.9 mpg. The quartiles of any distribution are the values with cumulative proportions 0.25 and 0.75 They span the middle half of the distribution. What is the first quartile of the distribution of gas mileage? What is the third quartile of the distribution of gas mileage?What is the estimated standard error for a paired sample t test using the following data: Standard deviation of the difference score = 5 and n=100?In tests of a computer component, it is found that the mean time between failures is 909 hours. A modification is made which is supposed to increase reliability by increasing the time between failures. Tests on a sample of 25 modified components produce a mean time between failures of 955 hours. Using a 1% level of significance, perform a hypothesis test to determine whether the mean time between failures for the modified components is greater than 909 hours. Assume that the population standard deviation is 53 hours.
- For an upper-tail test at the 1% significance level, what is the appropriate critical value when a sample of size 28 is drawn from a normal population with unknown standard deviation?One important consideration in determining which location is best for a new retail business is the amount of traffic that passes the location each business day. Counters are placed at each of four locations on the five weekdays, and the number of cars passing each location is recorded in the table below. At 0.05 level of significance, is there sufficient evidence of a significant difference in the mean number of cars per day at the four locations?Using MS Excel,what is the computed value of the F statistic ? * Location II II IV 45 48 44 39 50 60 50 49 39 40 38 39 44 45 42 40 42 43 44 43 0.76 2.23 1.19 0.84In an automobile repair and service industry, the average number of defective items in all the lots of automobile parts produced by a machine last week was 8. The supervisor believes that the mean number of defective parts produced by the same machine will differ in the present week. To test whether the average differs from 8, he samples 30 lots to obtain the mean number of defective parts to be 9 with a standard deviation of 3.Using the critical value approach, identify the decision at the 5% level of significance. Group of answer choices The decision is not to reject H0 because the test statistic does not fall in the rejection region (-∞,-1.960] U [1.960, ∞). The decision is to reject H0 because the test statistic falls in the rejection region (-∞,-1.645]. The decision is not to reject H0 because the test statistic does not fall in the rejection region [1.645, ∞). The decision is not to reject H0 because the test statistic does not fall in the rejection region (-∞,-1.645] U…