In the past, 38% of all students pass the state high school exam on their first try. A school posts a first time passing rate of 56%. If the school had a sample size of 324, is the school's 56% really any different that the state's 38%?
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The scores of 133 males and 162 females on a test that measures a person's feelings are shown in the table below. Your conjecture is the "the feelings" of males and females in the population are different. Run a hypothesis test to check this proposition. Group Sample size x-bar Standard Deviation of the samp
Two high school principals are arguing about who has the better school. This principal for Hard Rock High, Desi Mall, draws a random sample of 100 of her seniors and finds that 75% scored above 650 on the math portion of the SAT. Sharon N. Formation, the principal of Preppy Magnet School, drew a sample of 25 students and found t
PiggyBank has narrowed its options down to two incentive plans: A. cash back when the consumer makes an online purchase; and B cash back when consumer makes a purchase at a clothing store. The bank doesn't know whether consumers would shop online more than at clothing stores. Information Experts has placed you in a gro
North Carolina State University looked at the factors that affect the success of students in a required chemical engineering course. Students must get a C or better in the course in order to continue as chemical engineering majors. There were 65 students from urban or suburban backgrounds, and 52 of these students succeeded. Ano
#4 In a study of hypnosis, breathing patterns were observed in an experimental group of subjects in a control group. The measurements of total ventilation (liters of air per minute per square meter of body area) are shown below. We want to know whether the groups follow the same distribution. Unfortunately, we cannot assume
#3 Heart disease patients often experience spasms of the coronary arteries. Because biological amines such as serotonin may play a role in these spasms, a research team measured serotonin levels post-mortem from patients who died of heart disease and from a control group that died of other causes. The data are summarized in t
See the attached file. Webber studied the relationship between pupal weight (in milligrams) and the number of ovarioles in females of the blowfly. We want to predict the number of ovarioles from the pupal size. (See table "Pupae" in Excel). 9.1 What test or procedure should be performed? 9.2 Perform the test and assess it
Plant physiologists were interested in the effects of different combinations of sugars on the growth of pea cultures grown in auxin. (see table 'Peas' in Excel) 8.1 What test should be performed? 8.2 Perform the test and report the significance. 8.3 If the test is significant, which test should you use to find which pa
PiggyBank has narrowed its options down to two incentive plans: A. cash back when the consumer makes an online purchase; and B. cash back when the consumer makes a purchase at a clothing store. The bank doesn't know whether consumers would shop online more than at clothing stores. Information Experts has placed you in a grou
1. A sample of 64 observations is selected from a normal population. The sample mean is 216, and the sample standard deviation is 15. Conduct the following test of hypothesis sing the .03 significance level. H0: µ ≥220 H1: µ < 220 a. State the null and the alternate hypothesis b. State the decision rule c. Compute
You're trying to explain null and alternative hypotheses to one of the senior managers at Company W and he's not "getting it" when you use snack food sales. Help him by thinking about a business problem in another organization or department. Formulate a null hypothesis and the corresponding alternative hypothesis that could be t
What is the five-step process for hypothesis testing? Is the order important? Why or why not?
1. Describe the general characteristics of a research study for which an independent-measures t would be the appropriate test statistics 2. What is measured by the estimated standard error that is used for the independent-measures t statistic? 3. Describe the homogeneity of variance assumption, and explain why it is import
See the attached file. Quaker Oats is contemplating changing the shape of its box from the quaint cylinder presently in use. Different random samples were selected from five stores of similar size in the same region, and one of the candidate boxes was substituted for the cylinder for several days. The following results were o
1. Based on the specific question under study, how can one always determine which is the null hypothesis (H0) and which is the alternative hypothesis (H1). 2. A consumer advocate tests the claim that the Toyota Corolla actually delivers less than 32 mpg (as stated on the advertisements). So, we have:
1. Degrees of freedom for the independent-measures t statistic can be computed as df = n 1 + n 2 - 2. True False 2. For an independent-measures study comparing two samples with n = 8 in each sample, the t statistic would have df = 15. True False 3. Which of the following rese
Ten automobiles were driven on a measured test track - once with standard gasoline with no additive and once with an additive supposed to increase miles per gallon (mpg). The results are given below: mpg / car # 1 2 3 4 5 6 7 8 9 10 without additive 19 22 25 18 26 21 23 28 24 24 with additive
Safe T cigarettes claim that their product has "low tar." Government standards are that this claim is invalid if there are more than 13.5mg tar per cigarette. A sample of five Safe T cigarettes gives 14.0, 13.7, 13.9, 13.8, and 14.1 mg of tar. Is there sufficient evidence at the alpha=0.05 significance level for the governmen
1. The dependent and independent variables as they are not correct. Please advise. 2. Also, need advise on formulating the research question and developing the hypotheses Equation: The random sample population is 500 people who shop for workout programs and equipment. The sample mean of those shopping is that they spend an
Equation: The random sample population is 500 people who shop for workout programs and equipment. The sample mean of those shopping is that they spend an average of $250.00 per purchase and perchance at least 2 to 3 items for working out and weight lost Assume that the population of consumers is normally distributed with mean M
Please help me with the following statistical problem: A sample is taken prior to a major election of likely voters. The null hypothesis is that the votes will be split 50/50. One candidate gets 54% of the support in the sample and the p-value for this sample is calculated to be 0.12. What is the correct interpretation o
Given the following information about a hypothesis test of the difference between 2 means based on independent random samples, what is the correct rejection region at a significance level of .05? Ha: Ua> Ub x1-112, x2=9 s1=4, s2=2 n1=13, n2=10.
Describe the results of the test and explain how the use of this hypothesis testing can be used to evaluate solutions to your research issue. Steadily rising transportations expend larger portions of the consumer budget. This test is specifically targeting funds spent on public transportation, gasoline, or toll fees. In orde
This is a hypothesis testing problem. I have set up the null and alternative hypotheses. I need assistance in completing the requirements located at the bottom of the document. Steadily rising transportations expend larger portions of the consumer budget. This test is specifically targeting funds spent on public transportatio
The weights of 9 of managers at Company X are determined. They have a mean of 70.2 Kg, and a standard deviation of 1.5 Kg. Use a 0.01 significance level to test the claim that managers at Company X have weights with a mean that is greater than the mean of 63.6 Kg for managers from the general population. Given that there are
Working at Company X is very stressful for any human being. Medecines Sans Frontires stepped in to see if there is any possible violations of human rights at the notorious Company X. They picked one hapless employee and have a group of 14 volunteer nurses measured his systolic blood pressure and obtained the following results
I need assistance testing a hypothesis and identifying the solution/variance, details are included in the attachment. A driving machine was employed to hit a sample of 41 each of two different brands of golf balls using the same force each time. The research team then measured the distance between the point of impact and wher
- Using PHSTat - Send Excel + Paste into Word also * Must write out a NULL & HYPOTHESIS and include BUT WHAT DOES THIS MEAN TO A MANAGER?? See attached file for solution template.
Statistics Questions: Normal Distribution, Hypothesis tests, Type I and Type II errors, critical region, significance level, sample size, Cohen's d,
1. In z-score formula as it is used in a hypothesis test a. Explain what is measured by M- µ in the numerator. b. Explain what is measured by the standard error in the denominator. 2. The value of the z-score that is obtained for a hypothesis test in influenced by several factors. Some factors influence that size of the n