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# Hypothesis Testing

### 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

### Regression Equation for Treatment and Errors

In a completely randomized experimental design, 18 experimental units were used for the first treatment, 10 experimental units were used for the second treatent, and 15 experimental unites were used for the first treatment. Part of the ANOVA table for this experiment is show below. (Source of Variation, Sume of Squares, Degress

### 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

### Bayesian Statistics: Find the posterior odds

The human X chromosome carries gene that is essential for normal clotting of the blood. The defect in this gene that is responsible for the blood disease hemophilia is recessive: no disease develops in women who have at least one X chromosome with a normal gene. However, a man whose X chromosome has the defect gene develops the

### 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

### Statistics Seven problems: Analyzing cirriculums of large school districts

Assume you are working on a team that has been commissioned by a large school district to collect and analyze data related to a recent curriculum experiment designed to improve student scores on state-wide standardized tests. The schools in this district are predominantly large, urban schools. School officials are interested i

### Hypothesis testing

1. · How does hypothesis testing contribute to the scientific knowledge base? What is one example of a null hypothesis statement? 2. Is correlation the same as causation? Explain your answer. What is one example of how human services managers may make predictions with statistics?

### 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

### Defining "Significance Level" and "P-Value"

Give a brief definition/explanation for the following terms: significance level and p-value.

### Sampling, Measurements, Hypothesis Testing for BOE

See attached data file. Assume that you are working on a team that has been commissioned by a large school district to collect and analyze data related to a recent curriculum experiment designed to improve student scores on state-wide standardized tests. The schools in this district are predominantly large, urban schools. T

### Greek Letters Question

Greek letters are used to describe characteristics of A) samples and populations. B) samples and sampling distributions. C) sampling distributions and populations. D) samples, sampling distributions, and populations.

### 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 Testing for claim that 3/4 of employees carry secondary health insurance

Please see attachment for problem in proper format. Suppose that a company CEO claims that more than ¾ of his employees carry a secondary health insurance. You decide to test his claim using a significance level of a = 0.02. A sample of 200 employees finds that 160 of them carry secondary health insurance. First, you set

### Hypothesis Testing for claim that 2/3 of students graduate within four years

Please see attachment for problem in proper format. Suppose a private university claims that more than 2/3 of their students graduate within four years. A random survey of 300 alumni finds that 190 of them graduated within 4 years. Given that the pair of hypotheses that correspond to the claim are: H0: p < 8804; 0.67

### Hypothesis Testing for Claim of Average Life Insurance Premium

** Please see attachment for the properly formatted problem ** Suppose that an insurance company claims that the average life insurance policy premium that he sells is \$450 per year. A sample of 40 customers yields a mean of = \$475 and a standard deviation of s = \$85. You decide to test his claim at the a = 0.05 signific

### Hypothesis Testing for claim that mean weekly sales are \$17,350

Please see attachment for problem for proper formatting. Suppose that a company 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 = \$1,500. Given that a pair of hypotheses that correspond to the claim are: H0: &#956; =

### Hypothesis Testing, Cohen's d & Power

See attached files for any format issues. 2. The value of the Z-score in a hypothesis test is influenced by a variety of factors. Assuming that all other variables are held constant, explain how the value of z is influenced by each of the following: a. Increasing the difference between the sample mean and the original popu

### 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

### Hypothesis Test: Critical Value

Suppose that a company claims that their mean weekly sales are \$12,250. A random sample 35 weeks yields a sample mean of with a sample standard deviation of s=\$1250. H0: m = 12,250 H1: m # 12,250 Find the critical values for the hypothesis test. Assume that the significance level is a=0.05. Answer: ______________

### Designing research questions and numeric hypotheses

What does it entail to construct a numeric hypothesis? How should research questions and sub-questions be formatted?

### 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

### Training course on capital punishment law: Null and research hypotheses & Type 1 and Type 2 errors

Capital punishment law is among the most complex bodies of law in the US. As a result of frequent errors, the Trial Judges Assn. has developed a special training course to try to cut down on the errors. To study whether the training is effective, you perform a hypothesis test. What are the null and research hypotheses? Descr

### Determining Null and Alternative Hypotheses

The mean height of a certain kind of plant is 125 centimeters. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs from 125 . State the null hypothesis H0 and the alternative hypothesis H1 that we would use for this test.