A recent study of 89 people showed they ate sandwiches (S) an average of 21.4 times and sd(S)=4.3.Calculate the test t statistic for the following hypothesis:(3 significant digits in final answer) Họ: Hs = 27.4 Ha: Hs + 27.4 %3D Answer:
Q: After conducting a one-sample Z-test, you arrived at a value of -12.5 for the z value. What is your…
A:
Q: he DASS-21 questionnaire is a validated measure of depression, anxiety, and stress. For the general…
A: Given that the mean for the anxiety for the population is 4.2 As it scales from the questions 0 to…
Q: A researcher is interested in the issue of cheating on college campuses. She conducts an anonymous…
A:
Q: At 5% level of significance, using the information: X,= 47; S1= 4; n1=11; X2= 39; S2= 3; n2= 11,…
A:
Q: 6.- The day after Thanksgiving-called Black Friday–is one of the largest shopping days in the United…
A: A confidence interval (CI) is a type of estimate computed from the observed data. It gives a range…
Q: You are conducting a study to see if the proportion of voters who prefer Candidate A is…
A: Denote p as the true proportion of the voters who prefer candidate A.
Q: Interpret the following statement regarding the statistical findings of a research study. “61% (n =…
A: Introduction: The outcome of a study involving low-carbohydrate and low-fat diets is given.
Q: viruses typically cause common colds. In a test of the effectiveness of echinacea, 31 of the 38…
A: Given data : x1= 31.0 n1= 38 x2= 83.0 n2= 97 significance level, 0.01
Q: Do ESL students score lower in English college placement tests than the national average? A…
A:
Q: A repeated-measures, a matched-subjects, and an independent-measures study all produce a t statistic…
A: From the provided information, A repeated-measures, a matched-subjects, and an independent-measures…
Q: In a study examining overweight and obese college football players, Mathews and Wagner (2008) found…
A: The question is about hypothesis testing.In a study examining overweight and obese college football…
Q: Fourteen different video games showing drug use were observed. The duration times of drug use (in…
A: Given, n=14 df denotes Degree of Freedom.
Q: For a population with u =70 and o= 8, what is the z-score cor %3D corresponding to X= 82?
A:
Q: a. Use a two-tailed test with a = .05 to determine %3D whether the tai chi had a significant effect…
A: 12. a. Let μd be the mean difference between the tai chi pain and stiffness. The hypothesis is, Null…
Q: A recent study investigated the characteristics of teeth in an extinct species. The values below…
A: The mean of the given data is calculated (using excel) as follows:
Q: In a test of h0 u=100 against ha :u>100 the sample data yielded the test statistic z=2.17 find and…
A: Given that Null and alternative hypothesis is. H0 : μ =100 Ha : μ >100 Test statistic z =2.17
Q: The results of a study that used an independent samples t-test was t(28) = 2.14, p = .01. Based on…
A: t(28) means that degree of freedom = 28 Now, degree of freedom for a t-test one sample case = n-1.
Q: matched-subjects study and an independent-measures study both produced a t statistic with df = 10.…
A: For the independent measure study both produced a t statistic with degree of freedom (df) = 10 Then,…
Q: A market researcher wanted to evaluate the difference in credit charges for customers of Bracy’s.…
A:
Q: A repeated-measures study comparing two treatments with a sample of n = 4 participants produces MD =…
A:
Q: A survey claims that 9 out of 10 doctors (i.e., 90%) recommend brand Z for their patients who have…
A:
Q: You are conducting a study to see if the proportion of voters who prefer Candidate A is…
A: P value calculates the possible chances of rejection of null hypothesis. * If p value is less than…
Q: Sal knows that parties of people on average spend 75 minutes at their restaurant. They wonder if…
A: Given Sample mean x̄=82, n=sample size=30, s=sd=17, level of significance ɑ=0.05
Q: A researcher interested in exercise endurance in older adults with coronary heart disease measured…
A: sample size (n)= 450sample mean ()= 6.2sample SD ()= 3.4= 1-0.85 = 0.15Want to calculate 85% CI.
Q: t(23) = 3.20, p = .01.
A: Given, t(23)=3.20 p=0.01
Q: Does listening to heavy metal music while studying improve performance on the GRE? A sample of 37…
A: Here, the sample size n is 37. The test statistic value (t) is given as 8.
Q: H1: p v (Please enter a decimal) c. The test statistic zv = (please show your answer to 3 decimal…
A: From the given What is the Alternative hypothesis Test statistic (z ) =? P value = ?
Q: Listed below are the overhead widths (in cm) of seals measured from photographs and the weights of…
A: a. Determine rs. rs= b. Determine the critical values. Critical values are
Q: 1. Verbal ability consists of at least two components: verbal comprehension (e.g., reading ability)…
A: The given two components are verbal comprehension and verbal fluency.
Q: Dr. Stevenson reported the following in a journal: “F (4, 106) = 10.09, p = .04.” Should Dr.…
A:
Q: Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 42 of the…
A: Provided information is, In the test of effectiveness of echinacea , it is claimed that echinacea…
Q: 52% of students entering four-year colleges receive a degree within six years. Is this percent…
A: p=0.52p⏞=129231 The test statistics is z=p⏞-pp(1-p)n=129231-0.520.52(1-0.52)231=1.169458≈1.169 The…
Q: The results of a one sample t test are reported as follows: T(15) = 1.70, p>.01. Based on these…
A: The given results are T15=1.70,p>0.01.
Q: The 2006 Statistical Abstract of the United States reports on a survey that asked a national sample…
A: Given that Sample size (n) = 80000 Suppose that one-third of all American households own a pet…
Q: A survey is conducted to determine if there is a difference in the proportion of students, parents,…
A:
Q: The null and alternative hypotheses would be: Ho: ?v Select an answerv (please enter a decimal) H1:…
A:
Q: Given random samples Y1, Y2, · . ., Yn from exponential A distribution, we want to find a test of…
A: Y1,Y2,....Yn ~ Exponential (λ). This means, the PDF of Yi is; f(y) =λe-λx , x>00 , otherwise. The…
Q: Using the results from Example 4.26, µ = 1.14 and o = 0.39, would it be appropriate to use the…
A: Given information: The mean and standard deviation of the given geometric distribution is µ = 1.14…
Q: Two sample T for Men vs Women SE Mean A physical therapist wanted to know whether the mean step…
A: To compare the means of two independent population, two sample t-test is conducted. When the…
Q: vrinkles after just 14 days of application. To test the claim, 10 women are randomly selected to…
A: The paired sample t-test , sometimes called the dependent sample t-test , is a statistical procedure…
Q: A researcher found that the two groups (n=25 in each group) they tested were significantly different…
A: A researcher found that the two groups (n=25 in each group) they tested were significantly different…
Step by step
Solved in 2 steps with 2 images
- Which choice would be correct? Extraneous variables that are not directly studied but may influence the DV can be statistically controlled by: a. ANOVA b. ANCOVA c. Friedman's two-way ANOVA d. MANOVAA standardized math test of fifth grade students produces a mean ?μ = 100 with a ?σ = 18. A sample of n = 36 students participated in "boost" training for their math skills. The sample M = 104 with S = 24. Did this "boost" training significantly improve students' math performance? Use ?α = .01.Listed below are the overhead widths (in cm) of seals measured from photographs and the weights of the seals (in kg). The purpose of the study was to determine if weights of seals could be determined from overhead photographs. Is there sufficient evidence to conclude that there is a correlation between overhead widths and the weights of the seals? Use a significance level of α=0.05. a. Determine rs. rs= (Round to three decimal places as needed.) b. Determine the critical values. Critical values are (Round to three decimal places as needed. Use a comma to separate answers as needed.)
- What is the IQR for the following box-and-whisker data: Min = 154, LQ = 180, Med = 197.5, UQ = 211, Max = 265 O a. 26 O b. 43.5 O c. 111 O d. 31The old variety of a plant has 70% pink flowers. A new variety is developed. In a random sample of 93 plants from the new variety, 59 had pink flowers. Test the claim that the percent of plants with pink flowers for the new variety is different than 70%. Use a 0.10 level of significance. Question 6 options: DO NOT Reject H0 Using a 0.10 level of significance there is not evidence to say the proportion of pink flowers is different than 0.70 Reject H0 Using a 0.10 level of significance there is evidence to say the proportion of pink flowers is not different than 0.70The effectiveness of surgery for weight loss reported here found that "The surgery was associated with significantly greater weight loss [than the control group who dieted] through 2 years (61.3 versus 11.2 pounds, P<0.001)." What test could have been used and how would it have been computed?
- In a test of H0: p = 0.40 against Ha: p # 0.40, the sample data yield the test statistics z = 1.78. Find the p-value for this test. Round your answer to 4 decimal places.Thirty different video games showing drug use were observed. The duration times of drug use (in seconds) were recorded. When using this sample for a t test of the claim that the population mean is greater than 92 sec, what does df denote, and what is its value? what's the value of df?The recidivism rate for convicted sex offenders is 12%. A warden suspects that this percent is different if the sex offender is also a drug addict. Of the 322 convicted sex offenders who were also drug addicts, 48 of them became repeat offenders. What can be concluded at the a = 0.01 level of significance? a. For this study, we should use z-test for a population proportion V b. The null and alternative hypotheses would be: Ho: ? v Select an answer (please enter a decimal) H1: ? v Select an answer v (Please enter a decimal) c. The test statistic ? v = (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? V a f. Based on this, we should Select an answer v the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest the population proportion is not significantly different from 12% at a = 0.01, so there is statistically insignificant evidence to conclude that the population proportion of…
- Denny studied factors affecting cardiovascular reactivity to a postural change in a sample of healthy men and women. Change in systolic blood pressure (SBP) from supine to standing position was used as the measure of cardiac reactivity in a sample of 842 adults. Supine measurement of blood pressure was taken after participants had lain on an examination table for 15 minutes. Blood pressure was determined every 30 seconds using a Dinamap device for 2 minutes, and the measurements were averaged. Participants then stood up immediately, and additional measurements were made for another 2 minutes. Below is a table describing the characteristics of Denny’s sample: Which measures of dispersion, if any, are presented in this table (Ranges, SDs)? If age is normally distributed, approximately what percent of the sample would be younger than 50? If BMI is normally distributed, approximately what percent of the sample would have a BMI higher than 33.1?A study was conducted of 90 adult male patients following a new treatment for congestive heart failure. One of the variables measured on the patients was the increase in exercise capacity (in minutes) over a 4-week treatment The previous treatment regime had produced an average increase of μ = 2 minutes. The researchers wanted to evaluate whether the new treatment had increased the value of μ in comparison to the previous treatment. The sample data yielded ?̅ = 2.17 and ? = 1.05: Using α = 05, what conclusions can you draw about the research hypothesis?A clinical study was conducted on a medicine and the data obtained as follows: calculate Sensitivity Diseased •True Positive: 1000 •True negative: 50 Non diseased •True positive: 100 •True negative: 800
