A researcher hypothesizes that the percentage of Ball State University students who sleep 8 or more hours per night is lower than the general population of adults. Previous research has found that 40% of adults sleep 8 hours or more per night. In a recent survey of Ball State students, the researcher found that 38 students reported sleeping 8 hours or more and 82 students reported sleeping less than 8 hours. Do the Ball State student sleep habits differ from those expected of the general population of adults?
a. Using Excel, conduct a Chi-square goodness of fit test on these data.
b. Report the results in a textbox. Be sure to provide both a statistical and research conclusion.
In: Math
10. The National Collegiate Athletic Association (NCAA) requires colleges to report the graduation rates of their athletes. Here are data from a Big Ten university's report. For parts a and b, state your hypotheses, the test statistic and p-value, and then write a conclusion in terms of the problem.
(a) Ninety-five of the 147 athletes admitted in 1989-1991 graduated within six years. Did the percent of athletes who graduated within six years differ significantly from the all-university percentage, which was 70%?
(b) The graduation rates were 37 of 45 female athletes and 58 of 102 male athletes. Is there evidence that a smaller proportion of male athletes than of female athletes graduated within six years?
In: Statistics and Probability
2. A computer company looking for a new location for a plant has determined three criteria to use to rate cities. Pair-wise comparisons are given below.
| Recreation Opportunities | Proximity to University | Cost of Living | |
|
Recreation Opportunities |
1 | 1/3 | 1/5 |
| Proximity to University | 3 | 1 | 1/4 |
| Cost of living | 5 | 4 | 1 |
(b) Calculate the consistency ratio.
In: Operations Management
Please show your answer and a draw the graphs.
A radar unit is used to measure speeds of cars on a motorway. The speeds are normally distributed with a mean of 90 km/hr and a standard deviation of 10 km/hr. What is the probability that a car picked at random is travelling at more than 100 km/hr?
For a certain type of computers, the length of time bewteen charges of the battery is normally distributed with a mean of 50 hours and a standard deviation of 15 hours. John owns one of these computers and wants to know the probability that the length of time will be between 50 and 70 hours.
Entry to a certain University is determined by a national test. The scores on this test are normally distributed with a mean of 500 and a standard deviation of 100. Tom wants to be admitted to this university and he knows that he must score better than at least 70% of the students who took the test. Tom takes the test and scores 585. Will he be admitted to this university?
In: Math
please answer all parts of question, thank you so much
12. Identify the correct statements. Fix the incorrect ones.
a. A sampling distribution describes the distribution of data values.
b. A sampling distribution shows the behavior of a sampling process over many samples.
c. The probability distribution of a parameter is called a sampling distribution.
d. Sampling distributions describe the values of a data summary for many samples.
14. 14. Why is random sampling important?
18. A large university wants to send an exit survey to a SRS of 500 of its 3,827 graduating seniors. One question is, “Would you recommend to others that they should attend the university?” The response choices are: not sure, not likely, likely, definitely, most definitely. Describe how you would (in theory) use repeated sampling to obtain the sampling distribution of the sample proportion who would “definitely” or “most definitely” recommend the university to others.
In: Math
Kevin and Jenny, who are both working full-time, have three children all under the age of ten. The two youngest children, who are three and five years old, attended Eastside Pre-School for a total cost of $3,000. Ervin, who is nine, attended Big Kid Daycare after school at a cost of $2,000. Jenny has earned income of $15,000 and Kevin earns $14,000. What amount of childcare expenses should be used to determine the Child and Dependent Care Credit?
In: Finance
You have been appointed as financial manager for MBA. The company manufactures one product and uses standard costing system.
Standard cost per unit
Material 5kg at R12 50 per unit
Labour 2 hours at R35 per hour
Factory overheads R45 per labour hour.
Actual data for the month:
Number of units manufactured 12500
Material used R811 250
Issue price of material R13 75 per kg
Calculate and explain the difference between the total actual and the total standard cost.
Suggest a course of action
In: Accounting
In a recent study, among recently-graduated university students of the sample, only 4% of them wrote with their left hand. Yet, among grade 1 elementary-school students from the same sample, a full 20% of them wrote with their left hand. What is wrong with the conclusion from these data that writing with the left hand is bad for university success?
In: Math
Pablo is a Portuguese resident employed by a Portuguese company. He is sent to Australia to work on a shortterm project to assist with the establishment of a branch office of the company in Australia. Pablo works in Australia for one month. Throughout this period, his salary was paid into his Portuguese bank account. During the year, he earned the equivalent of A$120,000 from his employment. Does Pablo have to pay Australian tax on any of his salary?
In: Accounting
Pablo is a Portuguese resident employed by a Portuguese company. He is sent to Australia to work on a shortterm project to assist with the establishment of a branch office of the company in Australia. Pablo works in Australia for one month. Throughout this period, his salary was paid into his Portuguese bank account. During the year, he earned the equivalent of A$120,000 from his employment. Does Pablo have to pay Australian tax on any of his salary?
In: Accounting