Share
Explore BrainMass

Hypothesis Testing

Hypothesis Testing

An astronomer is testing the claim that the mean brightness of a certain star is now more than 30 units. She is able to get 6 readings on the star during her experiment as shown in the table. Using α = 0.01, does this indicate a new mean brightness of more than 30? DATA Reading Brightness 1 29 2 29 3 29 4 3

3693-stats

Category: Mathematics > Probability Problems Subject: Test of Statistical Hypothesis Details: To whom it may concern, I need help answering these 4 problems. Please include, 1) all the steps with details on how to arrive at each solution. 2) final solution I prefer to have everything worked out in MS Word and MS Ex

Does the questionnaire seem to be effective in identifying compulsive buyers?

Use traditional method of testing hypothesis. Researchers designed a questionnaire to identify compulsive buyers. For a sample of consumers who identified themselves as compulsive buyers, scores have a mean of 0.83 and a standard deviation of 0.24. Assume the subjects were randomly selected and that the sample size was 32. U

Is the mean time greater than...

Use the traditional approach. Draw a graph showing the test statistic and critical values. Assume the population has a distribution that is approximately normal and the sample is simple random. Use the normal distribution or the Student t distribution, whichever is appropriate. Many college students require more than 4 years

Traditional hypothesis test approach

Use traditional hypothesis test approach. Draw a graph showing the test statistic and critical values. Assume the population has a distribution that is approximately normal and that the sample is a simple random sample. Use either the normal distribution or Student t distribution-check conditions to be sure which is appropriate.

Statistics

I have a poor understanding of this subject. Please assist me with the attachment and explain your steps so that I can try to understand this area. Please use the traditional method becasue I can follow it a little better. Thank you for your help.

The Ferguson Paper Company

Please see the attached file for full problem description. --- (1) The Ferguson Paper Company produces rolls of paper for use in adding machines, desk calculators, and cash registers. The rolls, which are 200 feet long, are produced in widths of 1 ½, 2 ½, and 3 ½ inches. The production process provides 200-foot rolls in

Formula Z

Use formula z=(mean of values in sample - mu subscript mean of values in sample) divided by (lower case sigma divided by sqrt number of values in sample) The claim is mu = 73.4 and sample statistics include n=35, mean of values in sample = 69.5, and s=8.7.

4113-stats

Subject: need a paired difference statistical analysis Details: I am writing a thesis and need a paired difference statistical analysis with a confidence level at 95% with t-value for alpha of 0.25 My hypothesis is that there is a statistically significant differnce between two test scores for the following samples (

Statistics

A coin tossed 10,000 times. Heads appears 5100 times. Do you think the coin is fair at the 0.05% level of significance? at the 0.01% level of significance?

For OTA 103997 or 103300 only

For OTA 103997 or 103300 only Express null hypothesis H subscript 0 and alternative hypothesis H subscript 1 in symbolic form. Use correct symbol (u(mu),p or,o(sigma)) for indicated parameter. The mean salary of professors is at least $60,000.

Statistics

The American Association of University Professors conducts salary studies of college professors and publishes its finding in the AAUP Annual Report. College professors are divided into two populations: faculty in public institutions and faculty in private institutions. The summary statistics for the starting salaries of the tw

A test for differences in variance.

Randomly selected statistics students were given five seconds to estimate the value of a product of numbers with a summary of the results of both groups given below. Does the order of the numbers appear to have an effect on the variances? Use a 0.05 significance level to test the difference between variances of the two samples.

Testing for difference in means

Name the test to use and the hypotheses first, then: 1. (18 points) The U.S. Bureau of Prisons publishes data in Statistics Report on the times served by prisoners released from federal institutions for the first time. Independent random samples of released prisoners in the fraud and firearms offense categories yielded the

This problem shows how to analyze a split plot experiment in SAS. The analysis of the data was done in SAS using PROC GLM. The SAS program and the output of that program are included in a separate document.

The effects of variety upon the learning of the mathematical concepts of Boolean set union and intersection were studied. Ss from 5th and 7th grades were selected from four randomly selected schools. They were randomly assigned to four fixed experimental conditions which varied in two ways. Ss in the large variety conditions wer

How to test hypotheses of population mean

Subject: Null/alt hypoth; decision rule; value of test stat; Ho and p-value, interpret Details: The manufacturer of the X-15 steel belted radial truck tire claims that the mean mileage the tire can be driven before the treads wear out is 60,000 miles. The standard dev of the mileage is 5,000 miles. The C Truck Company bought 4

Analyze the data.

Pearl(1968)reports lactation studies with ewes.In one of his experiments nine ewes were divided into groups of three.In group 1 the ewes and lambs were fed freely during the lactation period;in the other groups two different methods of restricting the food intake were used.He records the yields of residual milk in grams for each

Random sampling

A quality inspector is interested in the time spent replacing defective parts in one of the company's products. The average time spent should be at most 20 minutes per day according to company standards. To conduct the test, a random sample of 36 employees is chosen. The average time spent replacing defective parts for the

3848-stats

Details: 1. What is the between a raw score of 113 and 126 in a normal distribution with a mean of 100 and a standard deviation of 10? Find the area below and under the score of 135. 2. Test null hypothesis that urban and rural residents both have the same attitude toward gun control(data1). Group 1 is a group of the urban r

Solutions to six separate problems 1. Sample size calculation when estimating the mean of a normal distribution 2. Small sample hypothesis test for a population mean 3. Small sample hypothesis test for the difference of two population means 4. Hypothesis test for a population proportion 5. Small sample hypothesis test for a population mean 6. Hypothesis test for a population proportion

1.) In a normal distribution with mean 59 and standard deviation 22, how large a sample must be taken so that there will be at least a 90 percent chance that its mean is greater than 53? 2.) In the second week of June 1996, the average number of units produced per week for all models of automobiles manufactured in the U.S. w

Gamma

We know that the Gamma value=0.298 and the approxiamte p-value=.000 which is understood p-value<=0.001. So, under a significance level alpha=0.001, we should reject the null hypothesis, ie., there is a significance difference between the groups

Stats

Standards set by the FDA indicate that Americans should not exceed an average daily sodium intake of 3300 milligrams (mg). To find out whether Americans are exceeding this limit a sample of 25 Americans is selected and the mean daily sodium intake is found to be 3120 mg with a standard deviation of 800 mg. Is this sufficient to

Confidence Limits

Recall that the SAT math test has a theoretical mean of 500 and a standard deviation of 100: Suppose a sample of 50 mathematically -gifted youngsters scored a mean of 560 on the SAT math test. What would the 90 percent confidence limits be? What would the 99 percent confidence limits be for the same sample?

Decision criteria

Larry Jacava is considering producing a novelty item for golfers that will be sold through pro shops. Larry has decided on a selling price of $3.50 for the item. The item's variable cost of production is $2.00 per unit with a fixed cost of $3,750. Larry has marketed his production to local pro shops and believes the demand for t

Degrees of freedom, value of the test statistic, null hypotheses

The daily production rates of a sample of sixteen workers in a factory before and after a training program (which was shown to be effective in other plants provided the following results: Use alpha equal to .01 Mean of the difference scores 5 Standard deviation of the difference scores =8 Is this problem, one tail, two tai

Test of Hypothesis for difference in proportions: A random sample of 200 workers from Factory A showed that 130 were satisfied with their job. Another random sample of 125 workers from Factory B showed that 70 were satisfied with their job. Can it be concluded that the proportion of satisfied workers in Factory A is greater than in Factory B?

A random sample of 200 workers from Factory A showed that 130 were satisfied with their job. Another random sample of 125 workers from Factory B showed that 70 were satisfied with their job. Can it be concluded that the proportion of satisfied workers in Factory A is greater than in Factory B? Formulate and test the appropriate