The average sales in a  company  = 225 St devaitin = 40  Using z scores, any sale over what  amount would be an outlier

Q: In a frequency distribution the coefficient of skewness based upon the quartile is 0.6. If the sum…

A: Skewness is used to measure the shape of the distribution. There are three types of skewness, they…

Q: physicians

A: Number of success = x= 3145 n=5804

Q: In a sample of n=6 scores, five of those scores are each above the mean by one point. Where is the…

A: The formula for mean is given as: X¯=1n∑Xi We are given that: n=6X1=X2=X3=X4=X6=X¯+1

Q: • A researcher would like to evaluate whether a pain-relief patch designed for lower back pain is…

A: Given data: Number of patients included in the sample, n = 8. The researcher would like to evaluate…

Q: The population Mean is 125 with a st dev of 22.However , the population distribtuon is skewed to the…

A:

Q: Jennifer is a psychology student and, as part of a study, is observing the grades students earn on a…

A: she observe number of motivating comments for the class periods  here, independent variable x =…

Q: Given the image below, what can be determined about the z-score associated with the shaded area?

A: We have to identify the z score for given area inder Standard Normal curve.

Q: What is the Mean difference (d) and the SD of Difference?

A: Enter the values of Millennials and Zoomers in columns A and B of excel.   The sample mean for the…

Q: Your instructor has the Mid-Term examination grades. He told you that the 25th percentile is 51 and…

A: Given that, Your instructor has the Mid-Term examination grades. He told you that the 25th…

Q: Will, an art student, randomly sampled oil paintings in a museum. He wanted to find out how many oil…

A: Given :  Margin of Error  (E) = 0.02 The proportion of paintings that were created using the color…

Q: z-scores can be used to identify________,   ___________,  ____________ values.

A: Standard normal distribution: The normal distribution has mean as 0 and standard deviation as 1.…

Q: Test the Claim that the mean number of headaches people get in a week greater greater than or gequal…

A: The hypothesis test for one-sample mean can be done either by a z-test or a t0test.

Q: A survey of 100 fatal accidents showed that in 43 cases the driver at fault was inadequately…

A: We have given that , A survey of 100 fatal accidents showed that in 43 cases the driver at fault was…

Q: range, as a measure of spread, has the disadvantage of being influenced by outliers. Illustrate

A: Range is defined as the difference between the highest and lowest observation of a data set.…

Q: A sample of n = 5 scores has a mean of X-bar = 9. What is ∑X for this sample?

A: From the provided information, Sample size (n) = 5 Mean (x̅) = 9

Q: A survey of 400 non-fatal accidents showed that 189 involved the use of a cell phone. Determine a…

A: Given that, In a survey of 400 non-fatal accidents showed that 189 involved the use of a cell phone.

Q: Samuel Morse determined that the percentage of a's in the English language in the 1800s was 8%. A…

A: Denote p as the true proportion of a’s in modern newspaper. It is reported that proportion of a’s in…

Q: A sample with a mean of  8 has ∑ x = 72. How many scores are in the sample?

A:

Q: In a survey of high school seniors, 72% of those surveyed stated they were planning on attending…

A: Given: Percent of high school seniors stated that they were planning on attending college is = 72%…

Q: A student scored between 81% and 93% on all exams except for one that she failed with a 47% because…

A: Mean & Median : The mean of the data set is calculated by adding all observations in the data…

Q: The recidivism rate for convicted sex offenders is 8%. A warden suspects that this percent is…

A: Given Information: Hypothesized value of population proportion p0=0.08 Sample size n=321 Out of…

Q: Celyn is among the 1500 students of the school.If Celyn's score based on the Standard-Binet test is…

A: Given: Number of students = 1500 Score on standard Binest test is 105

Q: Find the proportion of Normally distributed observations with a zz-score above -2.84. Give your…

A: Given the proportion of Normally distributed observations with a z-score above -2.84

Q: on a 100 item test romel got a score of 88 which is the 9th decile what does it mean

A: Di = i * (n + 1)  10 th data

Q: A sample consists of n = 16 scores. How many of the scores are used to calculate the range?

A:

Q: f a score’s relative frequency is 0.27, what is its percent in the distributio

A: From the given information, the relation frequency is 0.27. The percentage corresponding with…

Q: A student at Tolland High School wondered if boys or girls at her school traveled a greater distance…

A: Given: Sample size for girls = 50 Sample size for boys = 50 The concern is to check the average…

Q: A survey of 400O non-fatal accidents showed that 189 involved the use of a cell phone. Determine a…

A:

Q: In a study with lower quartile 100, upper quartile 140 and median as 130 How many people can have…

A:

Q: A Harriss poll taken surveyed 2016 adults and found that 423 of them had one or more tattoos. can…

A: The hypotheses for the test is given below.Null hypothesis:H0: p = 0.25Alternative hypothesis:H1: p…

Q: The mean weight of 200 students is 50 kg and SD is 4 kg. If weight is normally distributed then find…

A: Solution: Let X be the weight of a student. From the given information, X follows normal…

Q: (d) Use inverse interpolation with cubic interpolation and bisection. Compute the true percent…

A: Part(d): Given, fx=x21+x2fx=0.85 Solving the above by cubic spline we will get,…

Q: Calculate the probable outlier data points.

A: Lower quartile = 13 Upper quartile = 24.5

Q: How many Biology students’ records need to be sampled to estimate the percentage who earn "A"s to…

A: The proportion is not provided therefore in worst case it can be assume as (p) 0.5. Margin of error…

Q: The recidivism rate for convicted sex offenders is 11%. A warden suspects that this percent is…

A:

Q: A test statistic works like a Z-score in that it measures the distance between ________________ and…

A: Consider that the population mean is µ and the sample mean is x̅ .

Q: The percentage of scores falling below a z-score of .65

A:

Q: mple is rder to be 99% confident that the sample proportion will not differ from the true proportion…

A: Given : Margin of error: ME = 0.06 sample proportion: p̂ = 0.23

Q: A normally distributed data set has a mean of 0 and the standard divitation of 2. What is the…

A: Given,mean(μ)=0standard deviation(σ)=2

Q: 2. On a placement examination, August scored lower than 1210 of 12,860 students who took the exam.…

A: Given information: On a placement examination, 12860 students appeared. Among these 12860 students,…

Q: Determine the P-value for a test of significance with t= -2.861, n = 20 and H₁ μ< 100. a

A: The given data is t=-2.861 n=20 Ha: μ&lt;100

Q: The 5-number summary of scores on a test is 142 148 183 Based on this information, 95 125 There are…

A: Given,minimum value=95Q1=125Q2=142Q3=148maximum value=183

Q: After 5 points are added to every score in a distribution, the mean is calculated and found to be u…

A: After 5 points are added to every score in a distribution, the mean is calculated and found to be µ…

Q: Use the figure to the right, which shows the percentages of adults from several countries who favor…

A: Decision rule using p-value :      1) Reject null hypothesis (H0) if p-value less than significance…

Q: A study at Harvard found that 44% of their students binge drink.  You are at Princeton doing a…

A: According to the provided information, a study at Harvard found that 44% of their students binge…

Q: According to the Distribution of Z table, ______ % of area is above a Z value of 0.82?

A: The normal curve is very helpful to know the area is below, above and between a Z value. If we can…

Q: State whether the z-score locates the raw score x within a sample or within a population…

A: Solution: Given data ×=50,        s=5, x̄ =40  To find: Whether the z-score locates the raw score x…

Q: For a set of observations, Q1 80 and Q3 = 130. %D Values greater than and less than are possible…

A: Solution

Q: A fire insurance company wants to relate the amount of fire damage in major residential fires to the…

A: Given: x y 3.4 26.2 1.8 17.8 4.6 31.3 2.3 23.1 3.1 27.5 5.5 36 0.7 14.1 3 22.3…

Q: The sample mean is obtained by dividing the sum of all sampled values divided by On-1 On-3 On-2 On-0

A:

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.