What is the difference between a null hypothesis and an alternate hypothesis? Explain what is meant by the critical value of a statistical value. The null hypothesis states that a difference, effect or relationship exists in a research situation? ______True _____False The confidence level expresses the degree of cert
See attached file for clarity. Stats questions, Fill in the blanks Q20-26. 20. Given H0: μ= μ0, then Ha : ___________________________________ . 21. Given H0: μ ≤ μ0, then Ha : ___________________________________ . 22. Given H0: μ ≥ μ0, then Ha : ____________________________
Place an 'X' in front of those issues that only relate to selecting a specific statistical test. (Do not put an 'X' in front of items common to all tests or not applying to statistical tests.) _____ The distribution (shape) of the population (e.g., normal, skewed, flat, etc.) _____ The measurement scale/nature of the data be
Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips. The mean shopping time, µ spent by customers at the supermarkets has been reported to be 35 minutes, but executives hire a statistical consultant and ask her to determine whether it can be concluded
The Data Sheet file is attached. Develop one research question to formulate a research hypothesis. Formulate both a numerical and verbal hypothesis statement regarding your research issue. Perform the five-step hypothesis test on data pertaining to your selection. Include your raw data tables and the results of the com
Please answer 12.7(e) e. State the conclusion of the test in part (d). Review of the previous exercise and answers: 12.1 A manufacturer of industrial chemicals investigates the effects on its sales of promotion activities (primarily direct contact and trade show), direct development expenditures, and short-range research e
See attached file with data set. Decision of Uncertainty PLEASE SHOW ALL WORK You are the quality manager for a bottling plant. If the filling process is working as intended, cans stamped with 12 oz. will be filled with just over 12 oz. of liquid. On average, the plant owners want 12.25 oz. in each can.
You will be asked to determine the correct decision (Reject Ho or Fail to Reject Ho) for each of the following tests of hypotheses. 1. A hypothesis test at the 0.05 level of significance with a p-value for the sample of 0.105. 2. A hypothesis test at the 0.025 level of significance with a p-value for the sample of 0.002.
See attached file for clarity. 12. The following data were obtained in a study using three separate samples to compare three different treatments. a. Use an analysis of variance with ? = .05 to determine whether there are significant difference among the treatments. b. Compute the value for ?2 for these data.
Type I and Type II errors Managers at an automobile manufacturing plant would like to examine the mean completion time, mu, of an assembly line operation. The past data indicate that the mean completion time is 43 minutes, but the managers have reason to believe that this value has decreased. The managers plan to perform a s
1) The EPA fuel economy rating says that the Toyota Prius hybrid car gets 48 mpg on the highway. Deborah wonders whether the actual long-term average highway mileage of her new Prius is less than 48 mpg. She keeps careful records of gas milegae for 3000 miles of highway driving. Her result is x̄ = 47.2 mpg. What are her
As part of a study of corporate employees, the director of human resources for PNC, wants to compare the distance traveled to work by employees at its office in downtown Cincinnati with the distance for those in downtown Pittsburgh. A sample of 35 Cincinnati employees showed they travel a mean of 370 miles per month. A sample of
The t distribution is a continuous distribution (Points : 6) True False 2. A confidence interval for a population mean (Points : 6) estimates the population range estimates a likely interval for a population mean estimates a likelihood or probability estimates the
How is hypothesis testing compared to our legal system, and do you agree?
The primary difference between an ordinal level and inteval level variable is: A. an ordinal level variable has a meaningful zero point while the inteval level variable has no zero point B. an interval level variable has an assumed equal distance between values while an ordinal level only displays an odered list C. an inter
Part 1 1. Use the ANOVA table SV----SS-----DF----MS----F Between 64---------------8 Within-------------2------ Total 100----------------- SSB = 64, SST = 100, MSW = 2, F = 8 a. The number of degrees of freedom corresponding to between treatments is? b. The number of degrees of freedom corresponding to within treatments i
Chapter 10 Questions The MacBurger restaurant chain claims that the mean waiting time of customers is 3 minutes with a population standard deviation of 1 minute. The quality assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 significance
Parametric and Nonparametric Data Identification Please provide explanations for the answers. Label each of the following situations "P" if it is an example of parametric data or "NP" if it is an example of nonparametric data. 1. A manufacturer produces a batch of memory chips (RAM) and measures the mean-time-between-fail
5 Steps of Hypothesis testing, test that there is no difference between each set. Level of significance is .05 What type of error could be made? A 15000 16000 14000 13000 14000 13000 15000 14000 13000 14000 13000 B 15000 13000 17000 15000 14000 19000 14000 16000 19000 The answer needs t
See attached file for clarity. 1. According to Giving and Volunteering in the United States, 2001 Edition, the mean charitable contribution per household in the United States in 2000 was $1623. A researcher claims that the level of giving has changed since then. State the null and alternative hypotheses using correct symbol
1) A student reads that a 95% confidence interval for the mean body mass index (BMI) of young American women is 26.8 ± 0.6. Asked to explain the meaning of this interval, the student says, "95% of all young women have BMI between 26.3 and 27.4." Is this explanation correct? Explain your answer. 2) You ask another student to
I conducted a blind taste test with 50 subjects (30 women, 20 men) to see if they could tell the difference between bottled and tap water. The 32 people identified what they drank correctly and 18 incorrectly. Of the 32, 20 were women and 12 were men. Of the 18, 10 were men and 8 were women. This test was conducted in one d
Let's say I have a new drug that I think helps diabetics. So I perform clinical trials in accordance with the FDA requirements. I give one randomly selected groups of diabetics the drug, and another sample gets a placebo pill. The diabetics who get the pill improve, the controls do not. I perform a t test on the data. Wh
A college class believes that the average grade average of psychology students and the average grade averages of biology students are different. The class found that the actual grade averages of a sample of 11 psychology students was 3.5 and the average grade average of a sample of 14 biology students was 3.3. What is the null h
4. Explain why t distribution tends to be flatter and more spread than the normal distribution. 12. Last fall, a sample of n = 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate the effectiveness of the new program, the sample was compared with the rest of t
Select one psychological personality assessment instrument or inventory to serve as the basis of this assignment. Explore the psychological literature to find three to five articles that test the use of this inventory or assessment on obsessive-compulsive disorder. Include the following information: o Describe the
Let Z be a standard normal random variable. Use the calculator provided to determine the value of c such that P (c <= Z <= -0.68) = -0.2064 Carry your intermediate computations to at least four decimal places. Round your answer to at least two decimal places. See attached file.
4. Explain why t distribution tends to be flatter and more spread than the normal distribution. 12. Last fall, a sample of n = 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate the effectiveness of the new program, the sample was compared with the rest of th
Degree of freedom, X^2 and F-tests Q1: What the degree of freedom tells us? Q2: What are the degree of freedom for t- test, X^2-test, and for F-test?
Describe a problem (real or fictitious) for which it will be appropriate to utilize a hypothesis test. Describe how data will be collected, sample size, assumptions, level of measurement etc.