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- If a set of exam scores forms a positively skewed distributition, it suggest that the majortiy of students did not score well on the exam. True or False?The Institute of Education Sciences measures the high school dropout rate as the percentageof 16-through 24-year-olds who are not enrolled in school and have not earned a high schoolcredential. Last year, the high school dropout rate was 8.1%. A polling company recently took asurvey of 1,000 people between the ages of 16 and 24 and found that 6.5% of them are highschool dropouts. The polling company would like to determine whether the dropout rate hasdecreased at a 5% significance leveluman blood is classified by the presence or absence of three main antigens (A, B, and Rh). When a blood specimen is typed, the presence of the A and/or B antigen is indicated by listing the letter A and/or the letter B. If neither the A nor the B antigen is present, the letter O is used. The following table gives the percent of a certain country's population having each of the eight possible blood types in the sample space. Note that the presence or absence of the Rh antigen is indicated by the symbols + or −, respectively. Blood Types A+ A− B+ B− AB+ AB− O+ O− Percent 35.9 6.1 9.5 2.5 3.2 0.8 37.2 4.8 (a) What is the probability that a person selected randomly from the population has a blood type that is type O or Rh+? (b) What is the probability that a person selected randomly from the population has a blood type that contains the A antigen? (c) What is the probability that a person selected randomly from the population has a blood type that is type AB or Rh−?
- We are interested in estimating the proportion of people that can identify Nebraska but not Vermont. In a class of 55 students, each student was requested to select a sample of 6 people, show each person a map of the US and ask the person to identify the states of Vermont and Nebraska. The following numbers are the counts that each student got, that is, each number is the count of people in the student sample of 6, that could identify Nebraska but not Vermont.2233010110020030002020001100002010000001000200000001010Note: You can cut and past these numbers into an excel spreadsheet to help you calculate the mean and the standard deviation and compute the confidence interval. If you have trouble pasting them, paste them to a text file first and then copy from there.When we collect all the students' data, we have a sample size of 6x55=330.Of the sample of 330 people, what proportion were able to locate Nebraska but not Vermont? (round answer to 3 decimals) Find a 95% confidence interval for…The director of the MBA program at Salterdine University wants to develop a procedure to determine which applicants to admit to the MBA program. The director believes that an applicant’s undergraduate grade point average (GPA) and score on the GMAT exam are helpful in predicting which applicants will be good students. To assist in this endeavor, the director asked a committee of faculty members to classify 70 of the recent students in the MBA program into two groups: (1) good students and (2) weak students. The file MBAStudents.xlsm summarizes these ratings, along with the GPA and GMAT scores for the 70 students. What are the coordinates of the centroids for the good students and the weak students? Use XLMiner’s standard data partition command to partition the data into a training set (with 60% of the observations) and validation set (with 40% of the observations) using the default seed of 12345. Use discriminant analysis to create a classifier for this data. How accurate is this…A recent year was randomly picked from. Researchers conducted a study to find out if there is a difference in the use of eReaders by different age groups. Randomly selected participants were divided into two age groups. In the 16- to 29-year-old group, 7% of the 628 surveyed use eReaders, while 11% of the 2,309 participants 30 years old and older use eReaders. 1985 to the present. In that year, there were 2,051 Hispanic students at Cabrillo College out of a total of 12,328 students. At Lake Tahoe College, there were 321 Hispanic students out of a total of 2,441 students. In general, do you think that the percent of Hispanic students at the two colleges is basically the same or different?
- 29: A Not for profit Organization (NPO) wants to create a sample of financially backward girl students who are unable to continue their higher education, from the AL Dakhliya governorate. The organization wishes to sponsor the students’ higher education expenses. For this purpose in the first stage, the NGO randomly selects some wilayats from the 8 wilayats in the Al Dakhliya governorate to form a sample and then selects all girl students from the selected wilayats to extend help to them by providing sponsorship for their higher education. What is the method of sampling used here? a. Convenience Sampling b. Stratified sampling c. Cluster Sampling d. Systematic sampling(6) A student surveys some students on campus in the evening and finds that 16 out of 20of the students she interviewed are part time students. She uses the data to estimatethe percentage of all students who are part time. What type of bias is present in hersample?(7) A pollster surveys people at a boxing match, asking them if they had even strucktheir spouse. Of the 32 people surveyed, 30 said no and the other 2 did not respond.What type of bias is in this sample?Develop two research hypotheses: (a) one that would be used to examine differences between two unrelated groups and (b) one that would examine differences between two dependent groups.
- Suppose a survey of USA Registered voters was taken to see their beliefs about extra-terrestial life. In other words whether or not people believed that life existed on other planets in our universe. The results are tabulated below according to party affiliation: Test the claim using a signficance level of 0.05, that belief in life exisiting on other planets is equally distributed among the different political parties. Party Believe in Life on Other Planets Democrat 20 Republican 45 Independent 34 Total = 99 WRITE THE correct Claim, Null and Alternative Hypothesis?Suppose that the unemployment rate for 18- to 34-year-olds was reported to be 10.6%. Assume that this report was based on a random sample of four hundred 18- to 34-year-olds A political campaign manager wants to know if the sample results can be used to conclude that the unemployment rate for 18- to 34-years-olds is significantly higher than the unemployment rate for all adults. According to the Bureau of Labor Statistics, the unemployment rate for all adults was 7.9%. Develop a hypothesis test that can be used to see if the conclusion that the unemployment rate is higher for 18- to 34-year-olds can be supported. H0: p ≤ 0.079 Ha: p > 0.079 H0: p > 0.079 Ha: p ≤ 0.079 H0: p < 0.079 Ha: p ≥ 0.079 H0: p ≥ 0.079 Ha: p < 0.079 H0: p = 0.079 Ha: p ≠ 0.079 (b) Use the sample data collected for the 18- to 34-year-olds to compute the p-value for the hypothesis test in part (a). Using ? = 0.05, what is your conclusion? Find the value of the test statistic. (Round…A consultant wants to ask workers at a factory about the workers' job satisfaction. Which of the following best describes a convenience sample of workers? All of the workers on the second floor of the factory building are easily accessible. So, the consultant selects the first 60 workers from the second floor to arrive at work on a particular day. The consultant takes a list of the workers and selects every 6th worker until 60 workers are selected. The consultant forms 5 groups of workers based on the workers' shifts. Then, he selects 12 workers at random from each group.
