Share
Explore BrainMass

Chi-Squared Test

Chi-square test on college credits

Observed frequencies Credits Earned Very Uncertain Somewhat Certain Very Certain Row Total 0-9 12 8 3 23 10-59 8 4 9 21 60 or more 1 7 12 20 Col Total 21 19 24 64 Step 1: State the null and alternate hypotheses H₀: Degree of certainty is independent of credits earned H₁: Degree of cer

Statistics: Real-Life Chi-square Testing with Pearson's

Also find the tables attached. Answer 2: I understand you want help only on Questions 2 and 3. I will provide the solution but know that you need help on the other parts including question 1. Solution: Expected Freq = n*p(since we are dealing with a binomial distribution). The probability is 1/5 for all options. Thus,

Hypothesis Testing Exercises

15.18 - 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 alpha = .01, is the degree of certainty independent of credits earned? Certainty Credits Earned Very Uncertain Somewhat C

Determine whether Independent

Problem 4 One of the questions on a recent Business Quarterly subscriber study was, "In the past 12 months, when traveling for business, what type of airline ticket did you purchase most often?" The data obtained are shown in the Excel worksheet Problem 4 and below. You are to test to determine if the type of ticket and the t

Chi-Square Hypothesis Test

Each year, the National Highway Traffic Safety Administration (NHTSA) together with the National Center for Statistics and Analysis (NCSA) publishes Traffic Safety Facts, which summarizes the motor vehicle traffic crash experience for the United States. Traffic Safety Facts 2001 includes trend data, crash data, vehicle data,

Chi-Square Test: Distribution of Licenced Drivers

Data from the Motor Vehicle Department indicate that 80% of all licensed drivers are older than age 25. a. In a sample of n=60 people who recently received speeding tickets, 38 were older than 25 years and the other 22 were aged 25 or younger. Is the age distribution for this sample significantly different from the distributi

Chi-Square Test: Do Olympic participants wearing red win more often?

The color red is often associated with anger and male dominance. Based on this observation, Hill and Barton (2005) monitored the outcome of four combat sports (boxing, tae kwan do, Greco-Roman wrestling, and freestyle wrestling) during the 2004 Olympic games and found that participants wearing red outfits won significantly more

Statistics: Marriage and Surnames

Research has demonstrated that people tend to be attracted to others who are similar to themselves. One study demonstrated that individuals are disproportionately more likely to marry those with surnames that begin with the same last letter as their own (Jones, Pelham, Carvallo, & Mirenberg, 2004). The researchers began by looki

Hypothesis Testing for the Motor Vehicle Department

Data from the Motor Vehicle Department indicate that 80% of all licensed drivers are older than age 25. a. In a sample of n=60 people who recently received speeding tickets, 38 were older than 25 years and the other 22 were age 25 or younger. Is the age distribution for this sample significantly different from the distributio

Chi Square Test: Channel Viewers & Cell Categories

See attached file. There are 2 problems. Type in formula used for each problem and show all calculations. If you use Excel or other software, you must embed them into the applications and not send as a separate attachment. Use the five step hypothesis testing process for Parts B and C.

Level of Significance

1. The Safety Director of Honda USA took samples at random from the file of minor accidents and classified them according to the time the accident took place. The sample data is as follows: 8am to 9am 6 accidents 9am to 10 am 6 accidents 10am to 11 am 20 accidents 11am to noon 8 accidents Noon to 1p

Pivot Table and Chi Square Hypothesis Test

Using the "Cumba" database file, create a pivot table of management level versus gender. Then copy the data from the table into a chi square table to see if a relationship exists between employee genders and their management level. What can you conclude at the .05 significance level? Salary (dollars) Gender Age (years

Statistic Example Problems

1. Big Mountain Power Company serves a region in which the following amounts of electricity are used annually (in millions of kilowatt hours). Year Consumption 1999 352 2000 357 2001 362 2002 369 2003 380 2004 382 2005 389 2006 391 2007 394 2008 405 a) Plot the data. b) Determine the regression equation and

Hypothesis testing problems related to ANOVA, t test, Chi- square

All of these questions are for my stat's class. I am having a really hard time understanding what needs to be done. I really want to learn what is going on.. I have double the amount of homework than the questions below. I went ahead and took one question from each section to get help with so I can see how to get the answers and

Statistics: Test a Claim about a Standard Deviation or Variance in pulse rates

See attached file. Pulse Rates of Men - A simple random sample of 40 men results in a standard deviation of 11.3 beats per minute (based on data set attached). The normal range of pulse rates of adults is typically given as 60 to 100 beats per minute. If the range rule of thumb is applied to that normal range, the result is a

Chi-square Test: Allergic reactions

Langewitz, Izakovic, and Wyler (2005) reported that self-hypnosis can significantly reduce hay fever symptoms. Patients with moderate to severe allergic reactions were trained to focus their minds on specific locations where their allergies do not bother them, such as a beach or a ski resort. In a sample of 64 patients who recei

Chi-Squared Test: Gender Distribution in College

The student population at the state college consists of 55% females and 45% males. a) The college theater department recently staged a production of a modern musical. A researcher recorded the gender of each student entering the theater and found a total of 385 females and 215 males. Is the gender distribution for theater

Chi square test of independence and test for goodness

Please explain fully. In a sample of 64 patients, suppose that 47 showed allergic reduced reaction and 17 show increased reaction. Are these results sufficient to conclude a significant effect? Assume that increasing and decreasing reactions are equally likely if the training had no effect. Use alpha .05 gender differe

Chi-square statistic: tests for goodness of fit and independence

Langewitz, Izakovic, and Wyler (2005) reported that self-hypnosis can significantly reduce hay fever symptoms. Patients with moderate to severe allergic reactions were trained to focus their minds on specific locations where their allergies do not bother them, such as a bench or a ski resort. In a sample of 64 patients who recei

Hypothesis Testing: Chi-square Test for Variance

3. A survey of 30 students at a local college found that the sample mean number of hours worked by students is 17 hours per week with a sample standard deviation of 2 hours. Use a 0.05 significance level to test the claim that the sample students come from a population with a standard deviation of 3 hours. (Assume that the sa

Statistics Chi-square test of independence for parked cars

A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Research question: At α = .05, does vehicle type vary by mall location? (Data are from a project by MBA students Steve Bennett, Alicia Morais, Steve Olson, and Greg Corda (See attached document

Chi-Square Test: Degree of Certainity & Credits Earned

See attached file. 15.18: 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? Credits Earned Very Uncertain So

Chi-square test for independence .

Employees of Axolotl Corporation were sampled at random from pay records and asked to complete an anonymous job satisfaction survey, yielding the tabulation shown. Research question: At alpha = .05, is job satisfaction independent of pay category? Pay Type Satisfied Neutral Dissatisfied Total Salaried 20 13

Hi square test for goodness of fit

In a three digit lottery, each of the three digits is supposed to have the same probability of occurrence. 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) Calculate expected frequencies for each class. C) Perform the chi-squa

Chi square: Is the cockpit noise level independent of flight

High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. A Boeing 727 co-pilot collected 61 noise observations using a handheld sound meter. Noise level is defined as "Low" (under 88 decibels), "Medium" (88 to 91 decibels), or "High" (92 decibels or more). There

Statistics: Student credits earned; noise readings for B-727; Cola drinkers

1: 15.18 Sixty-eight 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 = .05, is the degree of certainty independent of credits earned? Certainty Certainty of Major by Credits Earned

Hypothesis Test: Chi-Square Test of Variance

Hypothesis Test: Null: "Older people are more likely to buy American cars than younger people." Alternative: "Older people are not more likely to buy American cars than younger people." (please refer to the attachment for data) 1. State the null and alternate hypothesis. 2. Select the level of significance - the alpha

Chi-Square Statistic: Schizophrenia and Season Correlation

Although the phenomenon is not well understood, it appears that people born during the winter months are slightly more likely to develop schizophrenia than people born at other times. The following hypothetical data represent a sample of 50 individuals diagnosed with schizophrenia and a sample of 100 people with no psychotic dia