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Based on a study of salaries of man and women who drive expensive cars, a researcher concludes that owning an expensive car can cause people to become wealthier. do you agree with this conclusion
Explain what each part of the following statistical phrase means , as it would be reported in APA format t(4)= 2.87, p=0.032
Suppose that the reaction time (sec) to a certain stimulus is a continuous random variable with a density function given by f(x)= k/x for 1<=x<=10 and 0 otherwise.
In fact, it is positively skewed. What is the probability of selecting a sample of 45 one-bedroom apartments and finding the mean to be at least $2,365 per month? (Round z value to 2 decimal places
A normal distribution has a mean of 45, and an unknown standard deviation. Which random variable value below could possibly have a z-score of 2.4?
Professor Economises has 184 students in her introductory economics class. Suppose that the scores on the final exam in this class are normally distributed with a mean of 74 points and a standard de
Determinet the mean and standard deviation of x. How will you interpret the values of the mean and standart deviation of x.
A researcher reported a correlation of 1.25 between an IQ test and grades in EPY 6214. Which one of the following interpretations is most reasonable? (A) IQ is an excellent predictor of EPY 6214 gra
Samples of our students from an applied experimental design class were polled regarding the number of hours they spent studying for the last exam. All students anonymously submitted the number of ho
A researcher wishes to conduct a study on the self-esteem levels of adolescents. She believes that male adolescents have higher self-esteem than female adolescents. Self-esteem test were administere
A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the r
One of Mendel's breeding trials came out as follows. Make a Chi-square test to see whether these data were fudged.
Four hundred draws are made at random with replacement from a box. The average of the draws is 152.4, and their SD is 18. Someone claims that the average of the box equals 150. Is this plausible?
Sixty-four measurements are made on the speed of light. These average out to 300.007 and the SD is 10, the units being kilometers per second. Gauss model is assumed with no bias. (a) The speed of li
The following data show the number of individuals who admitted or did not admit the strangers (the investigators) into their homes: Helpfulness to Strangers Admitted strangers into their home Did no
A biologist wishes to estimate the effect t of an antibiotic on the growth of a particular bacterium by examining the mean amount of bacteria present per plate of culture when a fixed amount of the
According to a recent survey, about 33% of Americans polled said that they would likely purchase reusable cloth bags for groceries to reduce plastic waste. Suppose 45 shoppers are interviewed a loca
A certain typing agency employs two typists. The average number of errors per article is 1.5 when typed by the first typist and 2.4 when typed by the second. If your article is equally likely to be
The mean number of patients admitted per day to the emergency room of a small hospital is 3. If, on any given day, there are only 2 beds available for new patients,
A statistics professor finds that when she schedules an office hour for student help, an average of 3.7 students arrive. Find the probability that in a randomly selected office hour, the number of s
The average cost of tuition, room and board at small private liberal arts colleges is reported to be $8,500 per term, but a financial administrator believes that the average cost is higher. A study
A man claims to have extrasensory perception. As a test, a fair coin is flipped 26 times, and the man is asked to predict the outcome in advance. He gets 20 out of 26 correct. What is the probabilit
Suppose that 30% of a group of people have hazel eyes. Assume that passengers boarding the plane form a randomly chosen group. What is the probability that passenger 17 is the 3th one having hazel eye
The following probabilities for grades in management science have been determined based on past records:
After the exam, the professor wishes to determine if there is a difference in the level of difficulty of the two versions by determining if there is a significant difference in the mean scores. Assu