For small sample estimation, the t– value is obtained by using the alpha level and
Q: sample of n = 4 scores is selected from a population with μ = 100 and s = 20. If the sample mean is…
A: Given information: n = 4 μ = 100 s = 20. sample mean is M =110
Q: A sample of n = 4 scores has a mean of x̅ = 40, with a sum of squares of SS = 48. What is the…
A: Given that n=4, x̅ = 40 and SS=48 Consider, the variance, s2=SSn-1=484-1=16
Q: Find the lower and upper χ2 critical values at 95% confidence and sample size 16. Round to 3…
A: Given that Sample size n =16 95% confidence. Degree of freedom =df = n-1
Q: Find the t values that form the boundaries of the critical region for a two-tailed test with a = .05…
A: 1) Introduction :- Given :- We are given that r2 is equal to 0.25. We have to interpret it.
Q: A labor union is getting critical about gross absenteeism by its members. The union leaders had…
A:
Q: Data from a representative sample were used to estimate that 31% of all computer users in a recent…
A: The preliminary estimate is, p=31%=0.31The defined margin of error is, E=0.05Since the level of…
Q: A sample of 3 measurements are taken and recorded: x=7, y=10 and z=8 The sample mean is:…
A: Given - We have 3 samples x 7 y 10 z…
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A: It is given that Sample size n = 13 Sample variance s2 = 84.2 Level of significance = 5% Note :…
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A: According to the given information in this question We need to find the conclusion by p value
Q: What proportions of males and females wear a facemask while in a large parking lot? There is some…
A: p^m=Xmn
Q: For a sample of size n = 15, the critical z-score for 82% confidence is (two-decimal accuracy,…
A:
Q: (a) From the regression equation, what is the predicted used selling price (in thousands of dollars)…
A: It is given that the mileage x (in thousands of miles) that the Cadet had on its odometer at the…
Q: Let x represent the average annual salary of college and university professors (in thousands of…
A: State the hypotheses
Q: The Cadet is a popular model of sport utility vehicle, known for its relatively high resale value.…
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Q: In a certain school district, it was observed that 33% of the students in the element schools were…
A: The hypothesized proportion is 0.33.
Q: A sample of n = 49 scores with M = 43 is selected from a population with µ = 40 with σ = 21. What is…
A: Mean = 40 Standard deviation = 21 Sample size = 49 Sample mean = 43
Q: f n=7 scores has a mean of u=13. What is the value of EX
A: The formula of the mean is: Meanμ = ΣX N
Q: ores on a certain test are normally distributed with a variance of 15. A researcher wishes to…
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Q: A sample of 25 is selected from a population with μ=40 and a treatment is administered to the…
A: The sample size is 25 and the population mean is μ=40 The sample mean and variance are M=43 and s2=9…
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Q: Estimate the P-value for a test of H0: μ = 500 versus H1: μ < 500 with test value t = -1.738 and a…
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Q: Consider a normal population with µ = 50 and σ = 6. A sample size of at least which size needs to be…
A: The population standard deviation is 6 and margin of error is 2 or less.
Q: In a test of Ho: µ = 30 against Ha: µ> 30, the sample data yielded the test statistic z = 1.85. Find…
A: Given : Population mean = 30 z - value = 1.85
Q: A sample of n = 36 scores is obtained from a population with u = 100 and o = 24. If the sample mean…
A: GivenMean(μ)=100standard deviation(σ)=24sample size(n)=36sample mean(M)=104
Q: The Cadet is a popular model of sport utility vehicle, known for its relatively high resale value.…
A: Hi! Thank you for the question, as per the honour code, we are allowed to answer three sub-parts at…
Q: Highway engineers in Ohio are painting white stripes on a highway. The stripes are supposed to be…
A: Null Hypothesis: A hypothesis which is tested for plausible rejection is called the Null Hypothesis…
Q: Let x represent the average annual salary of college and university professors (in thousands of…
A: using excel we find p value
Q: A survey is conducted to determine if there is a difference in the proportion of students, parents,…
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Q: The Cadet is a popular model of sport utility vehicle, known for its relatively high resale value.…
A: We are given , the least-squares regression line for these data has equation y = 40.63 - 0.46x Y…
Q: Let x represent the average annual salary of college and university professors (in thousands of…
A: using excel we find p value
Q: A sample of n = 64 scores is selected from a population with µ = 60 and σ = 10. If the sample mean…
A:
Q: A simple random sample of size n=14 is obtained from a population with μ=67 and σ=19. Assuming…
A: From the given information, Consider, Sample size (n) = 14 Population with μ=67 and σ=19. Thus,
Q: The average age of licensed drivers in a county is µ = 42.6, s= 10, and the distribution is…
A: The null and alternative hypotheses are, The test is two tailed test The level of significance is,…
Q: Consider a normally distributed population of scores with a mean μ = 100 and σx = 10. What score has…
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Q: variance
A:
Q: What is the P(t>1.4) with a sample size of 10?
A: We have to find p(t>1.4)...
Q: investigate, the analyst selects a random sample of 500 households and finds that 98% of them…
A: We have to find the null and alternate hypothesis.
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- Data from a representative sample were used to estimate that 33% of all computer users in a recent year had tried to get on a Wi-Fi network that was not their own in order to save money. You decide to conduct a survey to estimate this proportion for the current year. What is the required sample size if you want to estimate this proportion with a margin of error of 0.04? Calculate the required sample size first using 0.33 as a preliminary estimate of p. (Round your answer up to the nearest integer.) The sample size of _____ should be used for this study because it will guarantee a margin of error of no greater than 0.04. The other sample size computed will only guarantee a margin of error no greater than 0.04 if p < _____ or if p > ______ .A sample of n = 16 scores is obtained from a population with μ = 70 and σ = 20. If the sample mean is M = 80, what is the z -score for the sample mean?The acceptable level for insect filth in a certain food item is 2insect fragments (larvae, eggs, body parts, and so on) per 10 grams. A simple random sample of 50 ten-gram portions of the food item is obtained and results in a sample mean of x=2.5 insect fragments per ten-gram portion. Complete parts (a) through (c) below.
- Snow avalanches can be a real problem for travelers in the western United States and Canada. A very common type of avalanche is called the slab avalanche. These have been studied extensively by David McClung, a professor of civil engineering at the University of British Columbia. Suppose slab avalanches studied in a region of Canada had an average thickness of u = 67 cm. The ski patrol at Vail, Colorado, is studying slab avalanches in its region. A random sample of avalanches in spring gave the following thicknesses (in cm). 59 51 76 38 65 54 49 62 68 55 64 67 63 74 65 79 (i) Use a calculator with sample mean and standard deviation keys to find x and s. (Round your answers to two decimal places.) X= cm S= cm (ii) Assume the slab thickness has an approximately normal distribution. Use a 1% level of significance to test the claim that the mean slab thickness in the Vail region is different from that in the region of Canada. (a) What is the level of significance? State the null and…The Cadet is a popular model of sport utility vehicle, known for its relatively high resale value. The bivariate data given below were taken from a sample of fifteen Cadets, each bought new two years ago, and each sold used within the past month. For each Cadet in the sample, we have listed both the mileage x (in thousands of miles) that the Cadet had on its odometer at the time it was sold used and the price y (in thousands of dollars) at which the Cadet was sold used. The least-squares regression line for these data has equation y = 40.86-0.45x. This line is shown in the scatter plot below. Mileage, x (in thousands) 29.7 27.8 26.8 24.2 21.1 23.0 24.3 15.4 37.7 23.6 34.4 27.8 23.5 20.9 259 Used selling price, y (in thousands of dollars) 27.4 29.4 31.2 30.1 31.7 31.7 27.2 34.2 23.4 28.2 26.3 26.5 33.7 30.6 267 Used selling price (in thousands of dollars) 40- 35+ 30- 25- 20 THIS 15 X 20 X X X 30 Mileagex (in thousands) X 35 40A previous study estimated the value of p to be 0.79. Find the minimum sample size required to ensure that your estimate (p) will be within 0.01 of p with 99.5% confidence. IMPORTANT: Use a critical value that you found with your calculator (not from a table), and round it 3 places after the decimal point before you plug it into a formula and perform your calculations. Do not round-off any other intermediate results. n=
- When using an independent samples t-test, the author of a journal article reported that t(30) = 3.60, p < .05. Should the researcher reject the null or fail to reject the null?The data in personalities is bivariate normally distributed Carry out a formal t-test for the association between extroversion and neuroticism in personalities H0: The population correlation coefficient is 0. HA: The population correlation coefficient is not 0. What is the value of the t-statistic corresponding to this test? Carry out a formal t-test for the association between extroversion and neuroticism in personalities. H0: The population correlation coefficient is 0. HA: The population correlation coefficient is not 0. What is the critical value of the t-statistic required to reject the null hypothesis at a confidence level of 0.05A score that is 2 points higher than the sample mean has a z-score of z = 0.5 and a score of X = 44 has a z-score of -1.00What is the sample mean?
- The Cadet is a popular model of sport utility vehicle, known for its relatively high resale value. The bivariate data given below were taken from a sample of sixteen Cadets, each bought new two years ago, and each sold used within the past month. For each Cadet in the sample, we have listed both the mileage x (in thousands of miles) that the Cadet had on its odometer at the time it was sold used and the price y (in thousands of dollars) at which the Cadet was sold used. The least-squares regression line for these data has equation Ŷ=42.80-0.53x. This line is shown in the scatter plot below. (The 2nd picture contains the rest of the data as it would not fit in the first pic and it includes the question as well.)A water hose manufacturer has developed a light-weight hose for home owners. Besides being constructed of a lightweight material. one of the characteristics of the hose is that it shrinks when it is not in use. When in use, the length of hose extends to its advertised length of 50 feet. Twenty hoses are tested to see if the hoses extend to the length of 50 feet. The sample mean of the length of the hoses is 49 1/2 feet with a s of 15 inches. Test the hypothesis at alpha = .01 that the hoses are not equal to 50 feet.Clothes dried outside smell better than those dried in a dryer because of a process called photolysis. Sunlight breaks down compounds that cause odor. A trained smeller is asked to smell a random sample of 20 towels. The smeller does not know it, but all of the 20 towels have been dried in the sun. The smeller is blindfolded and is not allowed to touch the towels but leans forward to smell the towel then rates the towel on a smell-scale of 1 to 10, where 1 is the an extremely unpleasant smell and 10 is a very good smell. A smell rating of 8 is typically attributed to a towel that is dried in the dryer. The mean smell rating for these 20 towels is approximately normal with a mean of 8.45 and the standard deviation is 0.887. A statistician performs a test of Ho μ = 8 versus H₁ μ> 8 where is the true mean smell rating for all towels dried in the sun. This test yields a P-value of 0.0176. What conclusion would you make at the significance level a = 0.05? Because the P-value of 0.0176 < α =…