psychologist is interested in testing whether serial killers are more introverted than the general population. A sample of 16 serial killers serving life sentences was tested and found to have a sample mean introversion score of 42 and standard deviation (s) of 12. If the population mean (µ) is 36, are serial killers significantly different from the normal population?  - what significant test did you use ?  - what type of error might you be making ?

Q: how many students must be randomly selected to estimate the mean weekly earnings of students at one…

A: Here we need to find the required sample size with 95% confidence. Given SD=54, Margin of error=5.

Q: Researchers at Texas A&M studied the effect of using standing height desks in an elementary school…

A:

Q: n this scenario, what is the test statistic? A linguist believes the average age children learn a…

A: Given: n= 21.0 ,x̄= 9.2 ,s= 2.5 µ= 10.0 ,degree of freedom= 20.0

Q: Raul received a score of 73 on a history test for which the class mean was 70 with a standard…

A: Here we need to find the z score and for that, we have to use the formula z = Value-meanStandard…

Q: Suppose you know the population average wage in the manufacturing industry in the U.S. is $26.72 per…

A: Type II error = P( Fail to reject Ho| When mu = 25)

Q: For a sample of 300 students, you find that the mean GPA is 3.35 with a standard deviation of .21.…

A: Solution: From the given information, Standard deviation is 0.21 and n=300.

Q: The claim that statistics consultants have mean income of $90,000 is to be tested at a=0.05. A…

A: Solution Here we want to test that statistics consultants have mean income of $90,000 is to be…

Q: The average test score in a particular class is m=30. If you scored a 40 and the class (sample)…

A: Introduction: Denote the score of a randomly selected student in a class as X. It is given that the…

Q: Many psychologists are concerned that the average level of anxiety in children has increased over…

A: According to the given information in this questionWe need to identify the correct option

Q: aul received a score of 79 on a history test for which the class mean was 70 with a standard…

A:

Q: You are testing the claim that the mean GPA of night students is different from the mean GPA of day…

A: Night students are taken as group 1. Day students are taken as group 2. Given:…

Q: An article in the Register stated that students in the state university system take 4.5 years, on…

A: Givensample size(n)=49Mean(x)=5.1standard deviation(s)=1.2significance level(α)=0.01

Q: The population mean is 75 and the population standard deviation = 6. Random samples (containing 16…

A: Given , The population mean ( n )   = 75 ,  the population standard deviation ( σ )= 6

Q: statistics professor reported that the mean score in a recent quiz is 72 and the standard deviation…

A: Solution

Q: An article in a local town newspaper discusses the results of state test scores in their town. The…

A: Answer:-

Q: An article in a local town newspaper discusses the results of state test scores in their town. The…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: Suppose you know the population average wage in the manufacturing industry in the U.S. is $26.72 per…

A: true mean value = 25 mu = 26.72 s = 2.6

Q: A highly selective boarding school will only admit students who place at least 1.5 z-scores above…

A: The mean is 110 and the standard deviation is 12.It is given that a highly selective boarding school…

Q: You are applying for a job at two companies. Company A offers starting salaries with u = $34,000 and…

A: The z score formula is: The z-scores that are equal to 2 or greater than 2 are considered an…

Q: A statistics professor announces that 15% of the grades he gives are As. The results of the final…

A: It is given that the mean and standard deviation are 83 and 6, respectively.

Q: This year’s group of high school students did poorly on their final exams (M = 69, s = 11.3),…

A: Given information- We have given the mean and standard deviation of the high school students final…

Q: Suppose a population has a mean happiness score of 75 and a standard deviation of 15. Researcher A…

A:

Q: A developmental psychologist would like to know whether success in one specific area can affect a…

A:

Q: How many business students must be randomly selected to estimate the mean monthly earnings of…

A: From the given information,Confidence level ,C = 0.95 Using formula,

Q: A statistics instructor, when asked how students do on the first statistics exams claims that  the…

A: From the provided information, Sample size (n) = 22 Sample mean (x̄) = 74.2 Sample standard…

Q: For a random sample of 40 students, the average statistics midterm score is 73 points (out of a…

A: The sample size is 40, average statistics midterm score is 73 points, and standard deviation is 7.3.

Q: A successful basketball player has a height of 6 feet 4​inches, or 193cm. Based on statistics from a…

A: The z-score identify that the value how many standard deviations from the mean. If the z-score is…

Q: What was the cutoff for a failing score? Approximately what percentage of the students failed?

A: The scores on a psychology exam were normally distributed with a mean of 68 and a standard deviation…

Q: You are interested in the average dollar amount lost by burglary victims. The National Insurance…

A: From the provided information, Population standard deviation (σ) = 600 Sample mean (x̄) = 2222…

Q: he scores on a psychology exam were normally distributed with a mean of 65 and a standard deviation…

A: Given,μ=65σ=6

Q: A researcher predicts that showing a certain film will change people’s attitudes toward alcohol. The…

A: The mean score of the experiment for 36 people is 70. In general the mean score of the people on the…

Q: A coach believes that her volleyball team is more athlêtič than thể average Volleyball ted…

A: The standard error can be calculated as: SE=sn

Q: n a population, the mean score on a measure of satisifaction is 50, with  standard deviation of 16.…

A:

Q: A study tracked walking habits of 1136 randomly selected adults in the United States. The study…

A:

Q: How productive are employees? One way to answer this question is to study annual company profits per…

A: Here we will use 2 sample t - test ( Equal variance)

Q: According to the College Board, scores on the math section of the SAT Reasoning college entrance…

A: Given information, Mean =516 Standard deviation =116

Q: A student scored 66 on a general science test where the class mean and standard deviation were 82…

A:

Q: You are testing the claim that the mean GPA of night students is different from the mean GPA of day…

A: