In the population, the average IQ is 100. A team of scientists want to test a new medication to see if it has either a positive or negative effect on intelligence, or no effect at all. A sample of 30 participants who I have taken the medication has a mean of 140 with a standard deviation of 20. Did the medication affect intelligence? Level of significance is 0.05.

Q: sample of 36 students to answer the question, “How anxious do you feel when you know you have to do…

A: Given that  Sample size (n) =36 Sample mean (x¯) = 58 Sample Standard deviation (s) = 30 Confidence…

Q: If the scores on a test have a mean of 26 and a standard deviation of 4, what is the z score for a…

A: We want to Z-score

Q: compare the given values. The tallest living man at one time had a height of 264 cm. The shortest…

A: Mean=173.67Population standard deviation=8.72

Q: Justin got a score of 85 on an GE MMW examination for which the mean is 75. Justin realized that the…

A: Considering the mean score in the specified examination as μ and variance of scores in the…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Suppose that the random variable x defines the scores in psychology research.

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Consider X be a random variable which follows normal distribution indicating the score earned on a…

Q: on a national achievement test score was 850 with a standard deviation of 100. what proportion of…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: The distribution of scores is approximately normal with a mean of 31 and a standard deviation of 5.…

A:

Q: A population has mean 27 and standard deviation 12 . What is the data value that has a z-score of -2…

A: Given data, Mean=27 sd=12 z=-2 x=?

Q: The mean ACT score for 43 male high school students is 21.1 and the standard deviation is 5.0. The…

A: Given : Claim : Male and female high school students have equal ACT score averages.

Q: Use z scores to compare the given values.   The tallest living man at one time had a height of 225…

A: Given that  The tallest living man at one time had a height of 225 cm. The shortest living man at…

Q: Do shoppers at the mall spend more money on average the day after Thanksgiving compared to the day…

A: "Since you have posted a question with multiple sub -parts,we will solve first three sub parts for…

Q: Abby's score of 704 on the math portion of the 2002 GRE exam placed her in the 84th percentile rank.…

A: given data  Abby score x = 704 84th percentile σ = 141μ = ?

Q: A psychologist wants to estimate the amount of math anxiety that the population of high school…

A:

Q: Dr. Shoals predicts that people who walk a mile in moderately high heels will have less back pain…

A: From given : n=27 x¯1=6.75x¯2=3.25SD=3.37

Q: Marian found that the average height of female students in her psychology class was 63 inches with a…

A: According to the provided data,

Q: Jared has a mean of 74 on his quizzes, with a standard deviation of 7. On his most recent quiz, he…

A: If the z-score lies within 2 standard deviation away from the mean, then the score is not unusual…

Q: Use z scores to compare the given values. The tallest living man at one time had a height of 225 cm.…

A: Normal distribution in the center is generally denser and basically less dense at the tails. There…

Q: on the first statistics exam, the class average was 70 with a standard deviation of 6. you scored an…

A:

Q: standardized test has a pop. mean of 152 and a standard deviation of 16. Jenny has a score of 143.…

A: Given that Mean=M=152, Standard Deviation=Sd=16, Jenny score=X=143

Q: Jack had an average score of 75 with a standard deviation of 3. Mikes z-score was 1.85. His actual…

A: We have given that,  X be the random variable from normal distribution with mean Or average score…

Q: John finds that there is a scholarship available to all persons scoring in the top 5 % on the ACT…

A:

Q: An incoming MBA student took placement exams in economics and mathematics. In economics, she scored…

A: From the provided information, In economics, she scored 82 and in math 89. The overall results on…

Q: Some IQ tests are standardized to a Normal model, with a mean of 100 and a standard deviation of 16.…

A: Given,   Mean = 100 Standard deviation = 16