Grade inflation 2012. In 1996, 20% of the students at amajor university had an overall grade point average of 3.5or higher (on a scale of 4.0). In 2012, a random sample of1100 student records found that 25% had a GPA of 3.5 orhigher. Is this evidence of grade inflation?

Q: The average percent of correct responses on the midterm last semester was 78% with a standard…

A:

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of 65 and a…

A: It is given that the mean is 65 and the standard deviation is 8.

Q: If IQ scores are normally distributed with a mean of 100 and standard deviation of 12, what does…

A: The normal distribution is symmetric in nature having parameters μ and σ.The mean, mode, and median…

Q: In 2016, the 50th percentile score for household income in the United States was 59.039$. what…

A: The 50th percentile score for household income in the United States is $59.039.

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: suppose that you scored 60 on a test that has a population mean of 64 and a standard deviation of 8.…

A: Given: Test Score x=60 μ=64σ=8 Transform in which  μ=50σ=10

Q: Suppose you have a test with a mean of 66 and a standard deviation of 5. If you first increase…

A: Given Mean =66 Standard deviation=5

Q: In a population with mean 50 what standard deviation score would have a score of X=45

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Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What…

A: Obtain the z-score for the random variable X equals 85. The z-score for the random variable X equals…

Q: Suppose that the scores on the reading ability test are normally distributed with a mean of 70 and a…

A: We have to find z score for given data..

Q: Using the information below, calculate the confidence interval, rounding your limits to 3 decimal…

A: In this scenario the mean difference in monthly mortgage payments to be estimated. The appropriate…

Q: What is the most frequent number of over-the-limit items for this data set? ans = What is the…

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: Suppose the test scores in a class are normally distributed with a mean of 70 and a standard…

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: Suppose that the scores on a reading ability test are normally distributed with a mean of 60 and a…

A: Mean = 60 Standard deviation =9

Q: In a test of significance, you can conclude there is a statistically significant relationship when:

A: The provided information is as follows:The objective of the given question is to determine when…

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of 60 and a…

A: Given that μ=60 and σ=10

Q: Suppose that the score on a reading test are normally distributed within a mean of 70 and a standard…

A:

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of 65 and a…

A: given information: scores of reading ability test normally with μ=65  ,σ=8 we want to find P(test…

Q: Say that an extraversion scale has a population mean of 40 and a standard deviation of 10. About…

A:

Q: uppose that the scores on a reading ability test are normally distributed with a mean of  70  and a…

A: Given, Suppose that the scores on a reading ability test are normally distributed with a mean of  70…

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of  60  and…

A: We have to find out given probability..

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…

Q: How do we set an "alpha level" in science? How is this related to our comparison with a "p-value"?

A: -The objective is to define the α (i.e., alpha level) in hypothesis testing and its comparison with…

Q: A standardized memory test has a mean of μ = 100 and a standard deviation of σ= 10. What percent of…

A: Let X be the score in the memory test which follows normal distribution with mean 100 and standard…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.