What is the area of proportion below a z-score of -.91? What is the area of proportion between the mean and a z-score of 1.55

Q: What is the minimum percentage of data values that will come within 2.5 standard deviations from the…

A: To find the minimum percentage

Q: What is formula for converting a Raw Score to z?

A: The standard normal distribution: A continuous random variable Z is said to follow standard normal…

Q: The average verbal SAT score for the entire class of entering freshmen is 530. However, if you…

A: given  The average verbal SAT score for the entire class of entering freshmen is 530. However, if…

Q: The mean salary of federal government employees on the General Schedule is $59,593. The average…

A:

Q: What is the difference in what a small P-value tells us compared to a high P-value?

A: P Value is a method to determine the significance of the result from a data. It basically tells you…

Q: under the area under the normal curve between the mean and +2.

A: Given: Mean of standard normal distribution μ=0 Standard deviation of normal distribution  σ=1 Let X…

Q: What is Standard Score?

A: A z-score is also known as the standard score that indicates the number of standard deviations a…

Q: What happens to the proportion of intervals that include the population proportion as the sample…

A: The formula for the confidence interval of population proportion can be written as: Here n is the…

Q: Explain how can we find the corresponding z-score of an area and a percentile.

A:

Q: The mean monthly food budget for 44 residents of the local apartment complex is $⁢617. What is the…

A: The sample mean is given as $617.

Q: On the past math summative exam the bottom 20% of students failed to pass the test.the mean for the…

A:

Q: 3. It reveals the raw score is below the mean average.

A: Given problem Given that   3. It reveals the raw score is below the mean average.

Q: Is there a significant difference between the mean sales of the two vendors? Test the claim at 0.05…

A: Here AS PER POLICY I SHOULD HAVE TO CALCULATE 3 SUBPART EVEN THOUGH I HAVE CALCULATED 4 KINDLY…

Q: Define the standard error of the mean difference score?

A: Standard error of the mean: The standard error of the mean is defined as the value of the standard…

Q: What is the Z-score o the 97 with standard deviation of 11.811 and a mean of 80.2?

A: What is the Z-score o the 97 with standard deviation of 11.811 and a mean of 80.2?…

Q: Find the proportion of scores greater than 70 mean is 90 standard deviation is 10

A: The standard normal distribution:A continuous random variable Z is said to follow standard normal…

Q: How do you compute the range, interquartile range and standard deviation

A: formula's of Range , Interquartile range and standard deviation.

Q: What z-score value separates the highest (top) 40% of the exam scores in a normal distribution from…

A: To find The z-score value that separates the highest (top) 40% of the exam scores in a normal…

Q: a. What is the 25th percentile of HDL in patients recelving the placebo? b What is median HDL. in…

A: a. First quartile: First quartile is the median of all the observations that are left to the…

Q: The National Assessment of Educational Progress (NAEP) gave a test of basic arithmetic and the…

A: We have to find out given answers...

Q: What are the strengths and weaknesses of the mean (average) as the measure of the center of the…

A: In statistics, three measures of central tendency are widely used. These three measures are also…

Q: A research article stated that there was a mean difference in depressive symptoms between male and…

A: From the provided information, The claim is that there was a mean difference in depressive symptoms…

Q: What is the area of proportion between the mean and a z-score of -2.88? What is the area of…

A: The area of proportion between the mean and a z-score of –2.88 = P(–2.88 < Z <0) = P(Z<0) –…

Q: What z-score value separates the highest 10% of the scores in a normal distribution from the lowest…

A: We want to find highest 10% value for z score

Q: What x-values correspond to the middle 40% of a population (20% on each side of the mean) with a…

A: Given that,  μ=21.4,σ=2.3 The x-values correspond to the middle 40% of a population are,

Q: What percent of cases ARE NOT between the mean and 0.21 standard deviations above the mean?

A:

Q: How do I explain applying the normal curve to a set of test scores?

A:

Q: What are the percentages of scores that fall between in the tails of a normal distributio

A: Given, Empirical rule: For a normal distribution, 68% of values fall within 1 standard deviation of…

Q: Erika scored at the 45th percentile on the Stanford Achievement Test (mean= 500, standard deviation…

A:

Q: hin 1 Distance o

A: Consumption of cigarette sticks for 30 Participants 4 10 4 7 8 7 8 7 9 3 6 2 3 9 9 4 10…

Q: What is the formula for converting z score to original score?

A: Solution: Let X be the random variable. Suppose X has a mean µ and standard deviation σ. Then, the z…

Q: A university administrator obtains a sample of the academic records of past and present students at…

A: Hypothesis testing is an act in statistics whereby an analyst tests an assumption regarding…

Q: When do you need to calculate and use a Z - Score?

A: Z - score :  A z-score describes the position of a raw score in terms of its distance from the mean,…

Q: What are the similarities and differences of statistical inference of single mean as compared to a…

A: Generally, in the testing of a single population mean the distribution of a particular test for the…

Q: A line for tickets to a broadway show had a mean waiting time of 20 minutes with a statistic…

A: Given, Mean = μ = 20Standard deviation = σ = 4       To find, P (X > 28) = ?

Q: what is the standard error (usually standard error of the mean)?

A: Standard error: The standard error of the statistic is defined as the standard deviation of its…

Q: How do you compute median in Excel?

A: Enter the given data in first column of excel sheet.

Q: What is the mean of a distribution of means that is blank the means of the population?

A: Given problem Given that

Q: Explain what happens to the individual differences in the f-Ratio for a repeated measure ANOVA.

A: In an independent-measures ANOVA, individual differences contributes to the variance in the…

Q: What happens to the graph of the normal curve as the mean increases?

A: The graph of the normal curve as the mean increases.

Q: Relative to the population mean, what happens to the possible sample means for samples of the same…

A: The sample mean is the average of all the observations sampled from the population.  If we have…

Q: what is your SAT score if scored in the 95th percentile? mean:1000 standard Deviation: 250

A: Obtain the SAT score if scored in the 95th percentile. The SAT score if scored in the 95th…

Q: Discuss the relationship between the margin of error and the standard error of the mean.

A:

Q: From the following marks 20, 22, 27, 30, 31, 32, 35, 40, 45, 48 obtained by 10 students, calculate…

A:

Q: What is the difference between t-statistic and z-score

A:

Q: A class of 150 students took a final examination in science. The mean score was 72% and the standard…

A:

Q: What is the Sum of Squares within group? What is the Mean Square between group?

A: Excel Procedure: Enter the data for Autistic, Normal and Mentally in Excel sheet>Go to Data…

Q: What percentage of area is above the mean on a normal curve?

A: Solved below.

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.