The effectiveness of a new headache medicine is tested by measuring the amount of time before the headache is cured for patients who use the medicine and another group of patients who use a placebo drug. Which type of hypothesis test would be suitable?
Q: Dr. Mackintosh believes a new olfactory therapy would be more successful in promoting weight loss…
A: We have to answer questions based on hypothesis testing.
Q: A new drug to treat psoriasis has been developed and is in clinical testing. Assume that those…
A: The test hypotheses are given below: Null hypothesis: H0:p1=0.02,p2=0.77,p3=0.16,p4=0.05 Alternative…
Q: a survey by Bea et.al., it was found that 218 of 1,062 urban residents had a history of allergic…
A:
Q: Compute the Pearson Correlation Coefficient for these data. r = The correlation is: Medium and…
A: Correlation: The correlation value is obtained using EXCEL. The software procedure is given below:…
Q: Are freshmen psychology majors more likely to change their major before they graduate compared to…
A: From the provided information,
Q: (a) Construct a 95% confidence interval for the difference in mean pain intensity between the two…
A: The degrees of freedom is, df=n1+n2-2=73+76-2=147 Computation of critical value: The critical value…
Q: I want general information about TWO WAY ANOVA , and when to use it ?
A: TWO WAY ANOVA :- The ANOVA (Analysis of variance) test compares the means of different samples and…
Q: A dentist wondered if his appointments were distributed evenly from Monday to Friday each week. He…
A: From given data we have : n=500
Q: se a 0.05 level of significance and te: tate the null and alternative hypothe : The two populations…
A: Given starting salaries of Public Accountant and Financial Advisor are: Public Accountant(P)…
Q: An educational software company wanted to see if students improved their entrepreneurial skills…
A: Here want to test if the students improve their entrepreneurship skills after participating in five…
Q: Identifying individuals with a high risk of Alzheimer’s disease usually involves a long series of…
A: Given Information : Identifying individuals with a high risk of Alzheimer’s disease usually…
Q: Explain the difference between the one-way fixed effects model and the one-way random effects model.
A: The term random and fixed are used in the context of ANNOVA and regression models and refer to a…
Q: A data collection method is described to investigate a difference in means. Determine which data…
A: In this case, the effect of women’s tears on men are tested.
Q: Do sports drinks help prevent cramps in endurance sports? At the end of a marathon, officials will…
A: Observational study: In observational study, the individuals of the study are observed by the…
Q: A doctor believes that the fruit and vegetable intake of Northern adolescents is different from the…
A: Know that Null hypothesis is denoted H0. And Alternative hypothesis is denoted H1. NOTE:- According…
Q: A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants…
A: Note:Thank you for the question. As your question has more than 3 parts, according to our policy, we…
Q: Identifying individuals with a high risk of Alzheimer’s disease usually involves a long series of…
A: Introduction: We have calculated the correlation using Excel. First, we have entered the data in two…
Q: a) State hypothesis, find the test statistic, and use any software for the P-value. Be sure to state…
A: The researchers want to check whether the data give good reasons to thinking that there is a…
Q: i) Find the regression equation for predicting 7-minute screen scores (Y) from the Cognitive series…
A: Given : We have given the values of X and Y variable X as a Scores in Cognitive series and Y as a…
Q: Illustrate the null hypothesis for a correlated t test?
A:
Q: A researcher is interested in examining how exposure to natural light influences mood. She randomly…
A: Introduction: It is of interest to compare the effect of three different levels of exposure to…
Q: Identifying individuals with a high risk of Alzheimer’s disease usually involves a long series of…
A: Patient 7 minute screen (X) cognitive series (Y) XY X2 Y2 A 3 7 21 9 49 B 7 15 105 49 225 C 4…
Q: A clinical trial is run among 40 HIV patients in order to assess the effectiveness of a new…
A: For the given statement, we need to tell if this True or False that, The most appropriate…
Q: Identifying individuals with a high risk of Alzeheimer’s disease usually involves a long series of…
A:
Q: freshmen business majors? 366 of the 673 freshmen psychology majors from a recent study changed…
A: From the given information we conduct z test for two proprtion.
Q: A professor claimed that a majority (more than 50%) of her students believe in ghosts. To test her…
A: What is the alternative hypothesis for this test? From the given information, Consider, x be random…
Q: Researchers in Britain asked some people about their daily coffee intake. Of the 22 people from that…
A: Of the 22 people from that group who had the highest coffee intake, nine of them reported hearing…
Q: A recent drug survey showed an increase in the use of drugs and alcohol among local high school…
A: Given, n1 = 100, n2 = 100 p1 = 67 and p2 = 61
Q: A researcher has participants expecting to receive either painful or mild electrical shocks during a…
A: Usually in survival analysis studies we can use both parametric and non-parametric statistics. For…
Q: Women with localized breast cancer are often given radiation treatment. A study tried to determine…
A: Given claim: New treatment would decrease the rate of recurrence. Null Hypothesis: H0:p2>=p1…
Q: When the P - value is equal to the alpha level, the null hypothesis should be accepted.
A: P-value is the probability value which is derived from test statistic and it is useful to decide…
Q: A research company wants to determine whether there is a difference in effectiveness of a brand-na…
A: Answer:A research company wants to determine whether there is a difference in effectiveness of a…
Q: A researcher conducts an independent-measures study examining how the brain chemical serotonin is…
A: A. Null and alternate hypotheses: The investigator is specifically interested to test whether the…
Q: Newspaper headlines at the time and traditional wisdom in the succeeding decades have held that…
A:
Q: The National Institute of Mental Health published an article stating that in any two-year period,…
A: Let P be the true proportion of American adults suffer from depression or depressive illness. Here…
Q: oup of 80 people who had been diagnosed as prediabetic because of high blood glucose levels…
A: Cinnamon(1) Placebo(2) x1 = 14 x2 = 10 n1 = 40 n2 = 40 p^1 = x1n1=1440=0.35 p^2= x2n2=1040=…
Q: When we see an interaction effect in a one-way independent ANOVA, this refers to: The…
A:
Q: est the claim that the proportion of people who own cats is larger than 50% at the 0.01 significance…
A: H0 : p =0.5 H1 : p >0.5 Population proportion = p₀ = 0.5
Q: A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent…
A: sample proportion = 39/68 =0.57 population proportion = 0.4 n = 68
Q: In a study conducted by the U.S. Department of Health and Human Services, a sample of 546 boys aged…
A: Given:: In a study conducted by the U.S. Department of Health and Human Services, a sample of 546…
Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…
A:
Q: A hospital reported that the normal death rate for patients with extensive burns (more than 40% of…
A:
The effectiveness of a new headache medicine is tested by measuring the amount of time before the headache is
cured for patients who use the medicine and another group of patients who use a placebo drug. Which type of hypothesis test would be suitable?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- A hospital reported that the normal death rate for patients with extensive burns (more than 40% of skin area) has been significantly reduced by the use of new fluid plasma compresses. Before the new treatment, the mortality rate for extensive burn patients was about 60%. Using the new compresses, the hospital found that only 42 of 89 patients with extensive burns died. Use a 1% level of significance to test the claim that the mortality rate has dropped. What are we testing in this problem? single proportionsingle mean (a) What is the level of significance? State the null and alternate hypotheses. H0: p = 0.6; H1: p ≠ 0.6 H0: μ = 0.6; H1: μ ≠ 0.6 H0: μ = 0.6; H1: μ < 0.6 H0: μ = 0.6; H1: μ > 0.6 H0: p = 0.6; H1: p < 0.6 H0: p = 0.6; H1: p > 0.6 (b) What sampling distribution will you use? What assumptions are you making? The standard normal, since np > 5 and nq > 5. The Student's t, since np < 5 and nq < 5. The Student's t, since np > 5 and nq…A physical therapist claims that 75% of people lose their balance if they close their eyes while standing on one foot. A gymnast feels that the rate is less than 75%. To test this, she randomly selects 100 people and finds that 80 of them lose their balance while standing on one foot. To determine if these data provide convincing evidence that the proportion of people who lose their balance while standing on one foot and closing their eyes is less than 75%, 150 trials of a simulation are conducted. The gymnast is testing the hypotheses: H0: p = 75% and Ha: p < 75%, where p = the true proportion of people who will lose their balance while standing on one foot and closing their eyes. Based on the results of the simulation, what is the estimate of the P-value of the test? A) 0.1133 B) 0.17 C) 0.887 D) 0.92An antidepressant has historically been known to relieve depression for 65% of patients who use the drug. The drug's formula was changed recently to include smaller dose of its main, active ingredient. Due to this change, a medical researcher suspects that among all people with depression who use the new version of the drug, the proportion, p, of people who find relief is lower than 65%. A random sample of 240 patients who use the new version is selected by the researcher, and 149 of them find relief from depression. Based on these data, can we support the researcher's claim at the 0.05 level of significance? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.) (a) State the null hypothesis H and the alternative hypothesis H,. Ho :0 H¡ :0 (b) Determine the type of test statistic to use. (Choose one) ▼ OSO (c) Find the…
- In a recent study of a random sample of 113 people, 92 reported dreaming in color. In the 1940’s, the proportion of people who reported dreaming in color was 29%. Is there evidence to show that the proportion of people who dream in color is different than the proportion in the 1940’s? What is the critical value for this hypothesis test? In a recent study of a random sample of 113 people, 92 reported dreaming in color. In the 1940’s, the proportion of people who reported dreaming in color was 29%. Is there evidence to show that the proportion of people who dream in color is different than the proportion in the 1940’s? What is the critical value for this hypothesis test? \pm1.96±1.96 \pm1.645±1.645 \pm2.575±2.575 \pm2.05±2.05 \pm2.33±2.33HR department wants to make sure that their hiring practices are independent of gender. In other words, they want to ensure that both men and women have an equal chance of being hired. The observed data related to this survey is summarized in the following table: Observed frequency Male Female Total Hired 45 35 Not Hired 32 28 Total Given Ho = “HR department hired male and female employees equally”, decide whether to reject or fail to reject the null hypothesis (α = 0.05).A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants are randomly assigned to receive the new treatment or a placebo and the outcome is pain relief within 30 minutes. Of the 200 participants who received the new medication, 75 reported pain relief, while 60 out of the 200 participants who received the placebo reported pain relief. Is there a significant difference in the proportions of patients reporting pain relief? Run the test at a 5% level of significance. Give each of the following to receive full credit: 1) the appropriate null and alternative hypotheses; 2) the appropriate test; 3) the decision rule; 4) the calculation of the test statistic; and 5) your conclusion including a comparison to alpha or the critical value.
- Why would the following be conducted using a Simple Anova test? You work at an alcohol and substance abuse center and run a youth program. You want to determine which intervention works best to build self-esteem for youth in your program. Currently youth are in one of three intervention modes - (1) group counseling, (2) individual counseling and (3) a group and individual combo. Because of time constraints, you are only able to measure self-esteem at one point in time. You use a standardized multi item self-esteem scale to evaluate their level of self-esteem after 8 weeks of the intervention.A research company wants to determine whether there is a difference in effectiveness of a brand- name ibuprofen and generic ibuprofen. What are the appropriate hypotheses for this testing scenario? Let µ equal the mean of the effectiveness of brand-name ibuprofen and µ2 equal the mean of the effectiveness of generic ibuprofen. O Ho: H1 - H2 = 0 Hạ: H1 - H2 > 0 O Ho: H1 - µ2 = 0 Hạ: H1 - H2 0 O Ho: X1 - X2 = 0 Hạ: X1 - X2 + 0A recent drug survey showed an increase in the use of drugs and alcohol among local high school seniors as compared to the national percent. Suppose that a survey of 100 local seniors and 100 national seniors is conducted to see if the proportion of drug and alcohol use is higher locally than nationally. Locally, 67 seniors reported using drugs or alcohol within the past month, while 60 national seniors reported using them. Conduct a hypothesis test at the 5% level. NOTE: If you are using a Student's t-distribution for the problem, including for paired data, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.)
- Identifying individuals with a high risk of Alzheimer’s disease usually involves a long series of cognitive tests. However, researchers have developed a 7-Minute Screen, which is a quick and easy way to accomplish the same goal. The question is whether the 7-Minute Screen is as effective as the complete series of tests. To address this question, Ijuin et al. (2008) administered both tests to a group of patients and compared the results. The following data represent results similar to those obtained in the study. Scores in 7minute-screen (Y) Scores in Cognitive series (X) 0 11 4 19 6 22 8 20 5 14 4 13 A) Calculate the Pearson correlation for these data. B) If the researchers centered the variable of 7-minute screen (i.e., every score in this variable minus its Mean), what would be the new value of correlation? C) Is the correlation statistically significant? Use a two-tailed test with α = .05.A researcher gathered a sample of participants who volunteered for a studying of phobias. She measured anxiety level of participants as they viewed photos of spiders and again when they viewed puppies. Which statistical test is appropriate for this study and why?Researchers investigate how the presence of cell phones influence the quality of human interaction. Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room. Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment. What statistical test is appropriate?