12. An independent-measures study uses n = 15 participants in each group to compare two treatment conditions. What is the df value for the t-statistic for this study? а. 14 b. 15 с. 28 d 29
Q: You may need to use the appropriate technology to answer this question. Consider the following hypot...
A: As per our guidelines we can solve first three sub part of question and rest can be reposted. Soluti...
Q: Consider testing the hypotheses Ho: 0 =0 versus H1: 0 = 1 based on a random sample of size n = from ...
A:
Q: The shape of the distribution of the time required to get an oil change at a 15-minute oil-change fa...
A: Solution: Given information: n= 40 Sample size μ= 16.1 Population meanσ= 3.2 Population standard dev...
Q: If a variable has a distribution that is bell-shaped with mean 22 and standard deviation 6, then acc...
A:
Q: Assume that this was the groupings last SHS Days: Athenian 280 Persian 265 Roman 260 275 Spartan If ...
A:
Q: Terri Vogel, an amateur motorcycle racer, averages 129.71 seconds per 2.5 mile lap (in a seven-lap r...
A: Given that Mean=129.71 Standard deviation=2.28 Note: According to bartleby experts question answers...
Q: TInterval Refer to the accompanying data display that results from a simple random sample of times (...
A: Given result ,
Q: uppose 4-year- unsu day unsupervised reas, considered safe. Suppose that the standard deviation is 1...
A: Given, Mean = 3 Standard deviation = 1.8
Q: A published report claims that 35% of college students have used an online dating site or app. Beli...
A: The random variable college students have used an online dating site or app follows normal distribut...
Q: Standard Ultimate Survival Model says that the force of mortality equals Ho = A+ Bc" with A = 0.0002...
A:
Q: Accounting The following information is available regarding the total repair costs of Comfort Design...
A: Given: Units produced Repair cost 1500 14875 1750 15500 1000 12,250 ...
Q: Three investors are dividing a piece of land worth $1,200,000. Each investor's value in thousands fo...
A: Land worth = 1200,000 We have to use long divider method to know every one share. Here Chooser 1 ...
Q: (a) Let d > 0, and let X be a continuous random variable satisfying X ~ øx (t). Make sure to write y...
A: Compared to the circuit defined in the CC1101 datasheet, the circuit presented in Figure 10 appears ...
Q: Let ?̅ be the mean of a random sample of size 90 drawn from a population with a mean of 117 and a st...
A:
Q: The following equation describes the median housing price in a community in terms of amount of pollu...
A: Disclaimer : “Since you have posted a question with multiple sub-parts, we will solve first three su...
Q: Bo + B1x + u, suppose that E(u) # 0. Letting a, = E(u), In the simple linear regression model y = sh...
A: Given that In the simple linear regression model y=, suppose that E (u) 0. Letting a = E (u), sh...
Q: A normal population has mean u = 55 and standard deviation o = 9. What is the 84th percentile of the...
A: Given that mean u = 55 and standard deviation o = 9.
Q: What is the area of the shaded region? Figure A and Figure B
A:
Q: A parameter is a numerical attribute of a while a statistic is a numerical attribute of a sample; po...
A: Followings are the Explanation of the question Option :- Population , Sample 1) Population :- It ...
Q: Use the data provided to find the proportion of respondents who own Dell, Apple, and HP computers. ...
A:
Q: A real estate agency says that the mean home sales price in City A is the same as in City B. The mea...
A:
Q: Determine whether a normal sampling distribution can be used for the following sample statistics. If...
A: Introduction: It is of interest to test whether the two population proportions are equal.
Q: Determine the area more than z=-1.03 0.8486 O 0.8485 O 0.1515 O 0.1516 Determine the area below z=-0...
A: The objective is to define the area (in terms of proportion) below or above the given z-scores.
Q: 1. How many random samples of size 3 can be made? [ Select ] 2. What are the possible sample means f...
A: Here sample is drawn without replacement
Q: In 1980, census results indicated that the age at which American men first married had a mean of 23....
A: The random variable age of first marriage follows normal distribution. We have to test whether the m...
Q: 1. A researcher believes that drinking apple cider vinegar each morning will reduce cholesterol leve...
A: Sine we only answer up to three sub-parts for a question, we will answer a, b, and c respectively. P...
Q: When testing the hypothesis (at the 5% level of significance) that the variance of the amount spent ...
A: In a sample of 50 business trips taken by employees in the HR department, a company finds that the a...
Q: We give JMP output of regression analysis. Above output we give the regression model and the number ...
A: There are 3 independent variables and 1 dependent variable. This is multiple regression analysis. We...
Q: You may need to use the appropriate technology to answer this question. Tourism is extremely importa...
A: Given that
Q: A. Read Quarter 3_Module 8 involving finding the probability of AUB on pages 3-8. Answer the problem...
A: Sample space=S={1,2,3,4,5,6,7,8} X={1,2,3,5} Y={2,4,6,8} Note: According to Bartleby guidelines expe...
Q: b. Let U and W be mutually exclusive events where P(U) = 0.32 and P(W) = 0.45. Find each of the foll...
A: here use venn diagram and probability rule
Q: Suppose that the joi_nt pro_b density function of the con_tinuou_s ra_nd_om var_iable_s Xan_d Yis g...
A: Given,fX,Y(x,y)=y+x224; 0≤x≤3 and 0≤y≤20; otherwise
Q: To balance inventory at Otto's Optometry, customer Gender and Eye Condition were collected in the da...
A: Customer # Eye Condition Gender 1 Farsighted Male 2 Bifocals Male 3 Nearsighted Male 4 Farsi...
Q: 1. Step - and - leaf display
A: Here We will use 7/4 for 74. 7 is stem and 4 is leaf.
Q: The Peabody Vocabulary Test have a standard score population mean of 100 and standard deviation ...
A: For the given data Perform z test for one mean
Q: A normal distribution has a population mean of u=75 and a standard deviation of o=9. What is the P(X...
A:
Q: A 6-foot sub valued at $60 is divided among five players (P1, P2, P3, P4, P5) using the last diminis...
A: The last diminisher method is used to assign the data in an order by pulling out something. It is al...
Q: How many computers? In a simple random sample of 140 households, the sample mean number of personal ...
A:
Q: People tend to evaluate the quality of their lives to others around them. In a demonstration of this...
A: Given that, the scores are measures of a life-satisfaction scale for a sample of n=9 elderly people ...
Q: a. What is the distribution of U = Y?? Explain using the concepts discussed in class. b. What is the...
A:
Q: You may need to use the appropriate technology to answer this question. A sample of 16 items from po...
A:
Q: what is the standard deviation of x1=20 x2=30 x3=32 x4=21 x5=24 x6=11?
A: Here data is given, 20,30,32,21,24,11 We will find standard deviation by this data.
Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of...
A: Given Population mean μ=182.1, population standard deviations σ=1, n=38
Q: You want to buy a washing machine, and a salesperson tells you that the mea mean repair cost of 29 M...
A:
Q: 5. If a researcher rejects a true null hypothesis, she has made a error. А. Туре I В. Туре II C. big...
A: Here , we know that, we reject the null hypothesis when it is true, it is called type1 error.
Q: The sugar content of the syrup in canned peaches is normally distributed, and the variance is though...
A:
Q: Determine the following: 1. Class size 2. Number of classes 3. Classmark of the third class
A:
Q: A statistical program is recommended. A certain company produces and sells frozen pizzas to public s...
A: Given Data: Year Revenue 1 8.53 2 10.74 3 12.98 4 14.11 ...
Q: A professional skier was trying to decide whether to use a new racing wax for cross-country skis. He...
A: Given The data is as follows: Sample size, n=8Sample mean, x¯=53.1Sample sd, s=7.0α=0.10
Q: The following list contains the number of hours that a sample of 8 middle-school students spent watc...
A:
q-12
Step by step
Solved in 2 steps with 2 images
- To evaluate the effect of a treatment, a sample is obtained from a population with a mean of μ = 25, and the treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be M= 27.4 with SS = 64. If the sample consists of 9 individuals, what is the t statistic, and are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with α = .05?3) A firm in Lebanon has developed a chemical solution that can be added to car gasolinewhich they believe will increase the miles per gallon that cars will get. The owners areinterested in estimating the difference between mean mpg for cars using the chemicalsolution versus those that are not using the solution. The following data represent the mpgfor independent random samples of cars from each population.with Solution without Solution______________________________n1 = 36 n2 = 42 x1 = 25.45 x2 = 24.1 _______________________________Assume that the populations are normally distributed and the population standarddeviations are known to be σ1 = 3.95 (with solution) and σ2 = 3.09 (without solution).Given this data, can the owners believe that there is a difference between mean mpg forcars using the chemical solution versus those that are not using the solution? Test using analpha level equal to 0.05.4) Given the following null and alternative hypothesis:H0: σ 2 ≤ 52HA : σ 2 > 52and the…To evaluate the effect of a treatment, one sample of n=8 is obtained from a population with population mean: u=40 and the treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be M=35. 1. If the sample variance is s^2=32, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with alpha=.05? (show work please, and state both experimental and statistical hypotheses, and state your decision regarding the H0. (all 4 steps of hypothesis test) 2a. If the sample variance is s^2=72, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with alpha=.05? (please show your work and state your decision regarding the H0.) 2b. Calculate Effect size by using r^2 (percentage of variance explained) and state the meaning of effect size.
- 31% of all pygmy softshell tortoises have stripes on their shells. A herpetologist in Cititon collects a sample of 28 pygmy softshell tortoises and finds that 8 of them have stripes on their shells. Is there enough evidence to conclude, at a significance of alpha = 0.05, that the proportion of pygmy softshell tortoises in Cititon with stripes on their shells is less than 31%? What is the claim? What is the null hypothesis? What is the alternative hypothesis? What is the test statistic? What is/are the critical value(s)? Do we reject the null hypothesis? What conclusion do we draw? What is the P-value for the problem above?The worker on examining his 20 rainfall sample points concluded that it is more than likely to rain on this May 1st. Describe two or three statistical steps he took to arrive at this conclusion.2. Consider a study where students are measured on whether they had an internship during their time at WKU (Y/N) and whether they had a job at graduation (Y/N). If we wanted to test whether having an internship was associated with having a job at graduation (i.e., internship holders were more likely to have jobs), why would the chi-square test be inappropriate for this hypothesis? How should we analyze our data?
- Consider the following: In general, when people diet they typically lose 10 lbs. (?σ = 2). A random sample of 16 people on the keto diet lost 15 lbs. Do people on the keto diet lose more or less weight than people on diets in general? 4. What is the research hypothesis? a) Weight loss in the keto diet sample does not differ from weight loss in the population of dieters in general (H1: X-bar = Mu) b)Weight loss in the keto diet sample does differ from weight loss in the population of dieters in general (H1: X-bar = Mu) c) Weight loss in the keto diet sample does not differ from weight loss in the population of dieters in general (H1: X-bar does not equal Mu) d) Weight loss in the keto diet sample does differ from weight loss in the population of dieters in general (H1: X-bar does not equal Mu)To evaluate the effect of a treatment, one sample of n=8 is obtained from a population mean: u=40 and the treatment is administered to the individuals in the sample After the treatment, the sample mean is found to be M=35. 2. If the sample variance is S2=73, are the dat sufficient to conclude that the treatment has a significant effect using a two-tailed test with alpha=.05?31% of all pygmy softshell toises have stripes on their shells. A herpetologist in Cititon collects a sample of 28 pygmy softshell tortoises and finds that 8 of them have stripes on their shells. Is there enough evidence to conclude, at a significance of alpha=0.05, that the proportion of pygmy softshell tortoises in Cititon with stripes on their shells is less than 31%? What is the claim? What is the null hypothesis? What is the alternative hypothesis? What is the test statistic? What is/are the critical value(s)? Do we reject the null hypothesis? What conclusion do we draw? What is the P-value for the problem above?
- The NAEP considers that a national average of 283 is an acceptable performance. Using α = .05, run a two-tail t-test for one sample to test Ho: µ=283 for the 2019 scores. Report the t-obt, df, and p-values. Would you reject the null hypothesis that the 2019 scores come from a population with average 283? If this is the case, does it come from a population from larger or smaller average?A nationwide study of undergraduate students reported that the mean number of drinks consumed per week during the spring semester is 7.96. The mean number of drinks consumed per week at USC is 7.64 (s.d.=2.55, N=412 Health services is concerned that USC students are consuming significantly more alcohol per week than the national average. Using an alpha level of .05, Is there sufficient evidence to be concerned? Be sure to select the correct critical value for the alternative hypothesis, and then use this evidence to make your conclusionA simple random sample of heights of 6400Englishmen has a mean of 67.85 inches and SD 2.56 inches, while a simple random sample of heights of 1600 Australians has a mean of 68.55 inches and SD of 2.52 inches. D the data indicate that Australians are, on the average, taller than Englishmen?