Based on the following exam scores, which interval would you not use for a probability histogram? 75,62,98,73,74,56,71,64,79,68,89,51,66,67,50,60,62,60,70,80,85,91
What is 0-50
100
Suppose the test scores on an exam show a normal distribution with a mean of 82 and a standard deviation of 5. Within what range do about 95% of the scores fall?
What is 72 < x < 92?
100
A season of football scores falls in a normal distribution with a mean of 35 and standard deviation of 6. What is the probability that a score was between 29 and 41?
What is 0.68?
100
A manager wants to study the effects that positive reinforcement has on an employee's willingness to work overtime. The control group is employees who are given no reinforcement. The experimental group is employees who are given positive reinforcement during their weekly meeting with their manager. Is this study experimental or observational?
What is experimental
100
The maximum risk that researchers are willing to take that hey make a mistake when they conclude that they have sufficient evidence that there is a difference or relationship.
What is the level of alpha?
200
What is z < -0.37?
What is 0.3557 or 35.57%
200
The heights of 250 basketball players had a normal distribution with mean 74 with a standard deviation of 2. About how many players' heights were between 70 and 78?
What is 238
200
Suppose the heights of students at a school show a normal distribution with a mean of 50 inches and a standard deviation of 4. Within what range do about 68% of the scores fall?
What is 46 < x < 54
200
In recent years, a number of web-based head hunting firms (i.e., companies that offer job placement services) have been created. Suzy Matchmaker, the owner of one such company, wanted to investigate the job offers that recent business majors were obtaining. In particular, Suzy believes that accounting majors were being offered higher salaries than management majors. To test this belief, Suzy began by examining transcripts of accounting and management majors. She then randomly selected an accounting and a management major whose grade point average (GPA) falls between 3.92 and 4 (the GPA scale had a maximum value of 4). She then randomly selected an accounting and a management major whose GPA is between 3.84 and 3.92. She continued this process until the 25th pair of accounting and management majors is selected whose GPA fell between 2.0 and 2.08 (the minimum GPA required to graduate is 2.0). From each participant, Suzy obtained the highest salary offer. Assume α = .10 for this scenario.
What is matched/paired test?
200
A prediction about the population that indicates a difference (or relationship), and the direction of this difference.
What is an alternative hypothesis?
300
A normal distribution has a mean of 27 and a standard deviation of 5. This is the probability that a randomly selected X value from the distribution is at most 32
What is 0.84
300
Suppose running times for a race show a normal distribution with a mean of 120 and a standard deviation of 15. Within what range do about 95% of the scores fall?
What is 90< x < 150?
300
The grades on a test fell in a normal distribution with mean of 86 and standard deviation of 4. What is the probability that a student's score falls between 78 and 94?
What is 0.95?
300
At a local gas station, attendants are supposed to check ID for anyone that looks younger than 40 years old when buying alcoholic products. Recently, an undercover agent observed the gas station for 8 hours and found that out of 200 customers that purchased alcoholic products 100 customers appeared to be younger than 40 years old. Ninety-five of those customers were asked for ID. Historically, these gas station attendants have checked 92% of customers looking younger than 40 years old. Has this gas station increased the checking of IDs for customers who appear younger than 40 years of age?
What is a single group proportions test?
300
Systematic over or under estimate of the population parameter.
What is sampling bias?
400
What are the 2 instances that you need to divide alpha by 2?
What is confidence intervals and 2 tail testing.
400
276 test scores fell in a normal distribution with a mean of 76 and a standard deviation of 3.5 About how many bills were between 65.5 and 86.5?
What is 275
400
Suppose the intelligence quotient of a population shows a normal distribution with a mean of 100 and a standard deviation of 15. Within what range do about 99.7% of the scores fall?
What is 55< x < 145?
400
Senior partners of Dowecheatem, an accounting firm in Little Rock, are concerned about recent complaints by some female managers that they are paid less than their male counterparts. In response to these charges, the partners ask their human resource director to record the salaries of female and male managers with equivalent education, work experience, and job performance. A random sample of these pairs of manager’s salaries was evaluated.
What is paired two sample means test?
400
Analytical procedures that used when researchers are interested in how groups compare or how variables are related and they want to infer results from a sample to a population.
What is inferential statistics
500
A group of 625 students has a mean age of 15.8 years with a standard deviation of 0.6 years. The ages are normally distributed. How many students are younger than 16.2 years?
What is 467 students?
500
Suppose the amounts of money earned by individuals for a fundraiser show a normal distribution with a mean of 40 and a standard deviation of 6. Within what range do about 68% of the scores fall?
What is 34 < x < 46
500
400 bowling scores gathered at the bowling alley had a normal distribution. The mean was 126 and the standard deviation was 17. How many scores fell between 92 and 160?
What is 380?
500
The amount of Ozone in the atmosphere, although present in minute quantities, is critical to life because it absorbs harmful ultraviolet (UV) radiation coming from the sun. Ozone is known to be at its largest concentration in the lower stratosphere during January and February. Scientists, seeking to determine which month had the highest concentration, took Dobson spectrometer measurements from a random sample of base stations over a 15-year period for each of the two months.
What is Paired two sample means test?
500
Standard deviation of the sampling distribution of the sample mean.