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Chi-Squared Test

Multiple choice questions from chi square test

1)The values in a chi-square distribution are always greater than 0 and A. are normally distributed. B. less than 1. C. can be quite large. D. are negatively skewed. ----------------------------------------------------------------- 2)In a 3 x 4 contingency table, there are A. four levels of each variable. B. two le

Chi square test for goodness of fit .

A distributor of personal computers has five locations in the city of Orlando. The sales in units for the first quarter of the year were as follows. At the (0.01) significance level, do the records suggests that sales are uniformly distributed among the five locations? And is the null hypothesis rejected or not, and why?

Chi square test for goodness of fit

The personal manager of a firm is concerned about absenteeism. She decides to sample the records to determine if absenteeism is distributed evenly through the six-day work week. The null hypothesis to be tested is: Absenteeism is distributed evenly throughout the week. The 0.01 level is to be used. The sample results are: (Chi-S

Chi square test for association

In a study similar to one conducted by Fallon and Rezin (1985), a psychologist prepared a set of silhouettes showing different females body shapes ranging from somewhat thin to somewhat heavy and asked a group of women to indicate which body figure they thought men would consider the most attractive. Then a group of men were sh

Chi-Square test for association

Apparently there is a huge amount of misunderstanding concerning how the process of visual perception works. Specifically, many people believe (incorrectly) that at least part of looking at things involves energy going out of the eyes rather than energy coming into the eyes. This misunderstanding seems to be more common among

Chi Square Tests

I am having trouble completing this problem. I know what it is asking for but calculating it has me completely stuck. Please help!!!! Exam scores of 40 students in a statistics class are shown. (a) Estimate the mean and standard deviation from the sample. (b) Assuming that the data are from a normal distribution, define bin

Important information about Chi square test for goodness of fit.

A group of department store buyers viewed a new line of dresses and gave their opinions of them. The results are below: Because the largest number (47) indicated the new line is outstanding, the head designer thinks that this is a mandate to go into mass production of the dresses. The head sweeper (who somehow became involved

Chi Square

Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major. Research question: At α = .01, is the degree of certainty independent of credits earned? Prof. Green's multiple-choice exam had 50 questions with th

Chi Square: Random Samples of Different Scenarios

1. A public policy researcher would like to know whether spending on cities and spending on the environment are statistically dependent. The following data were collected from a random sample of constituents in the voting district. 2. The US Department of Justice wanted to determine whether the sex of a person murdered is rel

Chi square: if there is no connection between weight and average number of hours spent watching TV, we should expect how many children to be spending 3-6 hours on average watching TV and who are more than 10 lbs. underweight?

Recent studies have found that American children are more obese than in the past. The amount of time children spent watchitg television has received much of the blame. A survey of 100 ten-year-olds revealed the following data as shown in the table below with regard to weights and average number of hours a day spent watching tele

Understanding chi-square distribution: A hypothesis test in Excel.

There are three loan officers at Farmer National Bank. All decisions on mortgage loans are made by one of these officers. The president of the bank would like to be sure that the rejection rate is about the same for the three officers. A sample of 200 recent applications yielded the following results. Is the rejection rate relat

A chi square hypothesis test.

A research organization has collected the following data on household size and telephone ownership for 200 U.S. households at the 0.05 level, are the two variables independent? Based on the chi-square table, what is the most accurate statement that can be made about the p-value for the test?

Chi-Square Testing

The following data is taken from a customer satisfaction survey for a food product. Perform a Chi-square test to test the claim of whether a statistically significant relationship exists between the customer's satisfaction level and decision to repurchase the food item again. You may use the manual method of calculation, or sho

Chi Square

A personnel manager is concerned about absenteeism. She decides to sample the records to determine if absenteeism is distributed evenly throughout the six-day workweek. The null hypothesis to be tested is: Absenteeism is distributed evenly throughout the week. The 0.01 level is to be used. The sample results are: Day of

Hypothesis testing using Chi square distribution.

A recent study by a large retailer designed to determine whether there was a relationship between the importance a store manager placed on advertising and the size of the store revealed the following sample information: Observed Frequencies (sample) Important Not Important Total Small

Evidence to Conclude Significance Tests

One possible side effect of air pollution is genetic damage. A study designed to examine this problem exposed one group of mice to air near a steel mill and another group to air in a rural area and compared the number of mutations in each group. Here are the data for a mutation at the Hm-2 gene locus: Mutation Steel mill air

Sample Size & Chi-Square Questions

1. Why do the critical values from the Chi-square distribution get larger as the degrees of freedom get larger? Recall that this is opposite the pattern for the t-table. 2. Why is choosing sample size important(with specific reference to proportions)?

Chi-Square Analysis of Distribution and Deviation of Any Sample

Three samples of Drosophila heterozygous for the recessive genes black body (b) and rough eyes (r) were inbred and the following data were obtained. A. perform a chi-square analysis for each sample assuming a 9:3:3:1 distribution. B. Is there a significant deviation in any of these samples? Use the table attached.

ChiSquare test for goodness of fit

The author drilled a hole in a die and filled it with a lead weight, then proceeded to roll it 180 times. (Yes, the author has too much free time.) The results are given in the frequency distribution in the margin. Construct the frequency distribution for the outcomes that you would expect from a die that is perfectly fair an

Chi-Square test for goodness of fit

Perform a Chi-Square Goodness of Fit (GOF) test to determine whether there is a difference between the observed values versus the expected values expected. The null hypothesis should be there is no statistical difference between the expected and observed distribution, and the alternate hypothesis is that there is a statistical d

CHi-Square test

15.8 In a three-digit lottery, each of the three digits is supposed to have the same probability of occurrence (counting initial blanks as zeros, e.g., 32 is treated as 032). The table shows the frequency of occurrence of each digit for 90 consecutive daily three-digit drawings. (a) Make a bar chart and describe it. (b) Calculat

Chi square test samples

Please see attached document. 1.TABLE 11-2. Many companies use well-known celebrities as spokespersons in their TV advertisements. A study was conducted to determine whether brand awareness of female TV viewers and the gender of the spokesperson are independent. Each in a sample of 300 female TV viewers was asked to identify

Photo Modifications: Distribution of Responses and Preferences

A researcher is investigating the physical characteristics that influence whether a person's face is judged as beautiful. The researcher selects a photograph of a women and then creates two modifications of the photo by (1) moving the eyes slightly farther apart and (2) moving the eyes slightly closer together. The original phot

Chi square, independence and other concepts

1. In a chi-square test, the sample data are called observed frequencies. True False 2. One advantage of the chi-square tests is that they can be used when the data are measured on a nominal scale. True False 3. A chi-square test for goodness of fit is used to evaluate a hypothesis

Statistics problems: Chi square test

1. A researcher is investigating the physical characteristics that influence whether a person's face is judged as beautiful. The researcher selects a photograph of a woman and then creates two modifications of the photo by (1)moving the eyes slightly farther apart and (2) moving the eyes slightly closer together. The origi

Chi-squared Test of Goodness of Fit

Charmers' Candy Store sells wrapped hard candies in the following flavors: strawberry, blueberry, lemon, lime, and orange. They advertise that there are equal proportions of each flavor in every size of their candy boxes. To test their claim, a parent opens her son's candy box and counts each flavor. On the next page are mom'

Chi square statistics and ANOVA tables

1 An investigator for a consumer cooperative organized a study of the mileages obtainable from three different brands of gasoline. Using 15 identical motors set to run at the same speed, the investigator randomly assigned each brand of gasoline to 5 of the motors. Each of the motors was then run on 10 gallons of gasoline, with

Statistical Analysis on Classes of Childcare Workers

A large study of child care used samples from the data tapes on the current population survey over a period of several years. The result is close to an SRS of child care workers. The current population survey has three classes of child care workers: private household, nonhousehold, and preschool teacher. Here are data on the