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Hypothesis Testing

Testing Means in a Two-Group Design

T test for independent groups and dependent groups (Two-group designs) 1. An LU professor is interested in whether there is a difference between undergraduate students and graduate students in the amount of time spent praying each day. The professor gathers information from random samples of undergraduate and graduate student

Standard Deviation and Mean Calculation Spread Sheet

A hospital human resources manager finds that the local average starting salary for nurses is $24,000. She randomly samples 10 nurse's salaries at the hospital and calculates a mean of $23,450 and a standard deviation of $400. RQ: Is the average starting salary for nurses in her hospital at $24,000 with a 95% confidence leve

Hypothesis Testing: Population mean and proportion

Please assist with answering the following questions attached dealing with Hypothesis Testing. Hypothesis Testing Setting Up Hypothesis 1. For the following problem statement, identify the null hypothesis H0 and the alternative hypothesis H1. Suppose that a mayor claims that the mean salary for the working profession

Company's Average Absentee Rate and P-Value Interpretation

1. Over the last year the absentee rate at a large corporation averaged 8.2 days absent with a standard deviation of 6 days. One department with 40 employees had an absentee rate of 12 days per employee. During an investigation the department head argued as follows: 'If you took 40 employees at random from the corporation, th

Statistics: Chapters 8, 9, 10 - 3 problems for each chapter

See attached file. Questions 6,16,18 for Chp 8 4, 10, 14 for Chp 9 4, 6, 8 for Chp 10 Chapter 8 #6 A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n = 25 third grade children is selected to particip

Hypothesis testing: Revolutionary hypothesis by Professor Brainstorm

Suppose a revolutionary hypothesis has been proposed by the famous Professor Brainstorm, and yet the truth were known, it really wouldn't fit facts. In the formal language of hypothesis testing, it is the null hypothesis that is true, not Brainstorm's hypothesis. (The professor interpreted his results at the 5 percent level).

Hypothesis for a new company program to teach reading to elementary students

1. Suppose that you work for a company that has just created a program designed to teach reading to elementary students. Discuss how an experiment could be created to see whether this product is superior to other reading programs. Develop a hypothesis, label the independent and dependent variables, discuss what the experimental

Test hypothesis that company claims they are meeting the standard

See attached data file. The excel file sales data provides data on a sample of customers. An industry trade publication states that the average profit per customer for this industry was $4500. Using a test of this hypothesis, can this company claim that they are meeting the standard? Can this company claim that they are e

Hypothesis Testing of Proortions: Lovastatin

Does lovastatin (a cholesterol-lowering drug) reduce the risk of heart attack? In a Texas study, researchers gave lovastatin to 2,325 people and an inactive substitute to 2,081 people (average age 58). After 5 years, 57 of the lovastatin group had suffered a heart attack, compared with 97 for the inactive pill. (a) State the

Use SPSS to analyze class anxiety at midterm and again at the end of the course

A professor wants to determine if his class' anxiety decreases over the course of the semester. He uses a test to measure a random sample of all students enrolled at midterm and again at the end of the course. He realizes by looking at the scale that good interval leval data is not reflected. Does the data reflect a signi

What are the appropriate Ho and Ha

Module 17 4. What are the appropriate Ho and Ha for each of the following research studies? In addition, note whether the hypothesis test is one-or two-tailed. a. A study in which researchers want to test whether there is a difference in spatial ability between left- and right-handed people. b. A study in which resear

Sample size & Normal Probability

1. Construct a confidence interval for µd the mean differences d for population of paired data. Assume that the population of paired differences is normally distributed. 10 different families are tested for the number of gallons of water a day they use before and after viewing a conservation video. Construct a 90% confidence

Larger proportion of college students than young children

Do a larger proportion of college students than young children eat cereal? Researchers surveyed both age groups to find the answer. The resulsts are shown in the table below. A. State the hypotheses used to answer the question B. Using a=.05, state the decision rule and sketch it C. Find the sample proportions and z stat

Hypothesis Testing of Mean: P-value Method

Use the p value method to determine whether or not to accept or reject the null and alternate hypotheses. 1. You are determining whether the true mean is less than 11 with a 95% confidence based on the following statistics: n(sample size) = 14 sample mean = 9 sample st. dev = 4 2. You are trying to determi

Find null and alternate hypothesis

I'm having a hard time understanding hypothesis testing and I would like to know how to set this problem up correctly and solve it so I know how to do this on an exam: The Crown Bottling Company has just installed a new bottling process that will fill 16-ounce bottles of the popular Crown Classic Cola soft drink. Both overfil

Critical Value, Sample Statistic & Probability Value

Please view the attached document for format. Please provide computation where necessary. 1. Suppose that the shoe company Alta Claims that their mean weekly sales are $17,350. A random sample of 35 weeks yields a sample mean of $10,450. With a sample standard deviation of s =$1500. Given that the pair of hypothesis that

Hypothesis testings, test statistics-distributions, probability

Q1).it is believed that 1 in every 10 cases are observed with diarrhoeal disease. To verify the claim, a sample of 10 persons is collected. A test is carried out at alpha=0.05. a).state the underlying distribution of the problem. b). find the probability that at least 7 persons carry the disease. c). A test is conducted at

Identify the Hypothesis: Claim of weekly losses

See attached file for better formatting. For the following problem statement, identify the hypothesis H0 and the alternative hypotheses H1. Suppose that a company claims that their weekly losses are no more than $2,500. A sample of 40 random weeks finds a mean weekly loss of $3,200 with an estimated population standard d

Hypothesis Test: Citical Value

Suppose that a small college claims majority of their students graduate within four years. A random survey of 250 alumni finds that 145 of them graduated within 4 years. Given that the pair of hypotheses that correspond to the claim are as follows: H0: p <= 0.50 H1: p > 0.50 Find the critical values for the hypothesis

Hypothesis Test

Suppose that a company claims that 67% of their employees (about 2/3) buy annual parking permits for parking at their workplace. A random survey of 120 employees finds that 62 of them have annual parking permits. Given that the pair of hypotheses that correspond to the claim are as follows: H0: p = 0.67 H1: p # 0.67 F

Hypothesis Testing for claim about average employee severance

Please see the attached Word document. Suppose that a company CEO claims that the average severance package for an employee at his company is $500,000. You decide to test his claim using a significance level of a=0.05. A sample of 55 employees yields a mean of =$485,155 with a sample standard deviation of s=$125,575. Firs

Hypothesis Test

Suppose that a small college claims that they graduate at least 500 students every semester. A random sample of 31 semesters yields a sample mean of 420 with a sample standard deviation of 65. H0: m >= 500 Ha: m < 500 Find the critical value for the hypothesis test. Assume that the significance level is a=0.02. Answe

Inference of population mean: Changing electrical field from natural level slows healing Is there good evidence that changing the electrical field from its natural level slows healing?

Inference of population mean: Changing electrical field from natural level slows healing Our bodies have a natural electrical field that is known to help wounds heal. Does changing the field strength slow healing? A series of experiments with newts investigated this question. The data below are the healing rates of cuts (m

Number of bottles and the probability of each number

Please see the attached file for full problem description. 1. Given the number of bottles (0,1,2,3,4) and the probability of each number being overfilled in one month, what is the expected number of overfilled bottles per month? E(X) = SUM(x*P(x)) 2. Given n=4 & p=.3 for a binomial experiment, the

3 Statistics Problems

1. Which hypothesis testing model would be used under each of the following conditions. Use the "model number" from my handout if you wish. By line the information given in each cell is: Level of measurement, number of groups, sample size to be taken, parameter of interest and any qualifications. [Please refer to the attachme

Hypothesis Testing: Legal Services & Sentence Satisfaction

See attached data set. Using AIU's survey responses from the AIU data set, complete the following requirements in the form of a report: Perform a two-tailed hypothesis test on both the legal services satisfaction and the sentence satisfaction variable's data using a .05 significance level. Begin by creating a null and a