4. On standard IQ tests, the mean is 100 with standard deviation 15. The results are very close to fitting a normal curve. Tojoin Mensa, one must be in the 98th percentile among all people taking the IQ test. What is the cut score to be in Mensa?

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: On a recent quiz, the class mean of 74 with the standard deviation of 3.9.  calculate the z-score…

A: Given data  μ = 74σ = 3.9x1 = 95x2 = 70

Q: Mean 255, x is 230 and z score is -2 find standard deviation

A:

Q: What is the corresponding Z- score, mean is 110, standard deviation is 8 and x is 90

A: In question, We'll find the Z - score for mean 110, standard deviation 8 and x = 90. The solution is…

Q: A successful basketball player has a height of 6 feet 8 ​inches, or 203 cm. Based on statistics from…

A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

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

A:

Q: The mean of the data is 25.16 and it's coefficient of variation is 18.75 . Find the standard…

A: The coefficient of variance, COV = sx¯*100 s is the standard deviation x¯ is the sample mean To find…

Q: The median score on a test was 80% with a standard deviation of 5%, what does that tell you about…

A: Central tendency is used to determine the average of the data set. Dispersion is used to determine…

Q: Suppose that IQ scores have a bell shaped distribution with a mean of 101 and a standard deviation…

A: The IQ scores have a bell shaped distribution with a mean of 101 and a standard deviation of 17.

Q: The scores on a standardized test are approximately normal with a mean of 83 and a standard…

A: Let T be minimum score needed to be in top 8%

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: George got a 75 on a math test. The reliability of the math test was .85 and the standard deviation…

A: Confidence Interval: A confidence interval, refers to the probability that a population parameter…

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: A recent survey of 200 people revealed that the mean time spent in watching television of teenagers…

A: We want to test that mean time spent in watching television of teenagers is differ from 3.8 hours.…

Q: There were 200 students and their intelligence were measured. The mean and Standard deviation…

A: N=200 Mean =110 Sd =14

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

A:

Q: he mean on an exam is 80 with a standard deviation of 5 points. If Joe scored a 90 on the exam, what…

A: given data, μ=80σ=5x=90 z score for the given data=?

Q: A commonly used standardized test in psychology research is designed so that the mean score of all…

A: From the provided information, Mean (µ) = 140 Standard deviation (σ) = 20 X~N (140, 20) Here X be a…

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

A:

Q: ly normal and has a standard deviation of 88% of students scored above a 800. What is the mean of

A: The mean of the binomial random variable obtained by the formula μ=np, where (n) is the number of…

Q: Mean is 235, standard deviation is 52, what is the percentile of a raw score of 28

A: Mean Standard deviation

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

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

Q: A study was conducted on shoe sizes of students, reported in European sizes. For the men, the mean…

A: Answer:- Given, In European sizes , the mean size = 43.96  standard deviation = 2.24  Also given…

Q: in how you determined your findings. How many children scored lower than Emily? How many children…

A: The standard normal variate of the normal distribution is continuous and follows that z~N(0,1). The…

Q: Test scores for the SAT are close to normal with an average of 850 and a standard deviation of 100.…

A: Given information: Mean SAT test scores μ=850 Standard deviation of SAT test scores σ=100 The SAT…

Q: The distribution of the scores on a standardized exam is approximately normal with mean 400 and…

A: The two values of Z that will contain 50% of scores lie are obtained as shown below:From the…

Q: You are provided with a mean of 28.18 with a standard deviation of 4.33.  What percent of students…

A:

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

A:

Q: 3. A taxi company claims that its drivers have an average of at least 12.4 years' experience. In a…

A: Givensample size(n)=15Mean(x)=11.2standard deviation(s)=2α=0.10

Q: This problem is fill in the blank. Just choose the correct answers. Thank you for your help   A…

A: Hypothesis: A statement or assertion about a population parameter is known as Hypothesis. Null…

Q: Determine the class average if the standard deviation was 8% and Henry’s mark of 85% is equivalent…

A: Given that,  The standard deviation =8%, Marks of Henry's =85%, and z-score =1.30.

Q: Suppose the exam average in a class is 55% with a standard deviation of 4. What proportion of…

A: The random variable score follows normal distribution. The population mean is 55.         The…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.