What z-score values form the boundaries for the middle 60% of a normal distribution? ​   a. ​z = +0.84 and z = –0.84   b. ​z = +0.39 and z = –0.39   c. ​z = +0.25 and z = –0.25   d. ​z = +0.52 and z = –0.52

Q: Determine the two values of z such that the middle 58% of the data lie between the two z-values.

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Q: Find the z-score that cuts off 70% in the body on the right.

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Q: If the percentage of scores falling between the mean and a z score of +0.50 is 19.15%, then what is…

A: Given: The percentage of scores falling between the mean and a z score of +0.50 is 19.15%.

Q: Draw a normal distribution for each of the following z-score locations. Then draw a vertical line…

A: If the value of Z-score is negative then say that this is left -tail and if Z-score is positive then…

Q: Find the z-score boundaries that divide a normal distribution. The middle 25% from the 75% in the…

A: Solution: From the given information, 25% area lies in the middle of the normal distribution and 75%…

Q: Iculate the mean and median and report the lower value of two.

A: Answer The sample size [n] = 10-7.4, -3.4, -2.7, -2.2, -1.9, -0.8, 0.3, 0.9, 0.9, 1.1The mean:The…

Q: What is the best way to evaluate the normal approximation of the variable?   a. Scatter plot…

A: The objective of the question is to identify the best method to evaluate the normal approximation of…

Q: he mean and variance for a standard normal distribution is:  A. mean = 1, variance = 0  B. mean =…

A: The expected value of a distribution is affected by an addition or subtraction or multiplication or…

Q: In a Normal distribution 7% items are under 35 and 89% are under 63. Find its mean and standard…

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Q: One sample with n = 4 scores has a mean of M = 12, and a second sample with n = 6 scores has a mean…

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Q: G iven:  mean =85    s=12     n =3500 What % of scores are between 97 to 109 ?

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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: 8. In baseball, is there a linear correlation between batting average and home run percentage? L…

A: A sample of baseball players batting averages and home run percentages is given.Let x be the batting…

Q: Calculate the average (mean) of the data shown, to two decimal places x 29.2 4 9.9 5.9 21.4

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Q: Which of the following z scores are above the mean? Choose all that apply.     0     1.35…

A: For normal distribution, the mean is equal to 0

Q: When finding the percentage of data in a given section of the normal curve, you are finding the…

A: here use basic of normal distribution

Q: The smaller the spread of scores around the arithmetic mean....?

A: The standard deviation is a measure of dispersion. It measures the variability in the data. If the…

Q: Check the following data for normality by finding nor-mal scores and making a normal-scores plot:…

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Q: Find the Z-score that describes the following proportions under the normal curve (within 0.01…

A: Given  P(Z<Z score)=10%

Q: This is a sample of lengths of fruit-fly thoraxes in millimeters. Find the mean and the median Of…

A: Mean refers to the average of a data set. It is obtained by the formula Arrange the data set in…

Q: Find the z-score boundaries that separate the middle 70% from the 30% in the tails in a normal…

A: Find the z-score boundaries that separate the middle 70% from the 30% in the tails in a normal…

Q: You are looking for a student at your college who lives within 10 kilometers from you. You recall…

A: Let X be the number of calls made to get the first success that is calling a student that lives…

Q: Use the standand normal distribution table to determine the percent of data between z=−0.51 and…

A: Given that : z=−0.51  and   z=0.73 By using the standard normal distribution we solve this problem.

Q: Find the following percentiles for the standard normal distribution. Interpolate where appropriate.…

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Q: For a standard normal curve, find the z-score that separates the bottom 70% from the top 30%.

A: Answer:- Given, a standard normal curve,               Find the z-score that separates the bottom…

Q: 1.8 2.3 6.7 11.3 16.7 25.2 26.9 27.9

A: Percentile is the value in the data below which certain percentage of the data lie.   For computing…

Q: Use a table of z-scores and percentiles to find the percentage of data items in a normal…

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Q: find the value between z score -2.9 and 1.5287

A: To find: Find the value between z score -2.9 and 1.5287

Q: For the standard normal curve, identify the z-score that corresponds to the 33rd percentile.

A: standard normal distributionZ~N(0,1)identify z score that corresponds to 33rd percentile

Q: what range of raw scores makes up the middle 40%

A: The middle 40% means, the scores lie between 30th and 70th percentile. From stand normal, z-score…

Q: Find the z-score that corresponds to the 63rd percentile

A: we have to find the Z-score that corresponds tothe 63rd percentile.

Q: The table below shows the frequency of AP Physics scores for a high school class. AP Score…

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Q: Identify the​ t-statistic and P-value.

A: The sample size n is 23.

Q: Find the z-score boundaries that divide a normal distribution as described in the following. The…

A: Solution: From the given information, 20% area lies in the middle of the normal distribution and 80%…

Q: Use a standard normal table to find the z-score that corresponds to the 5th percentile. Click to…

A: Answer:- Here we need to find the Z-score that corresponding to the 5th percentile.That is, we need…

Q: In an experiment the sorption was measured for a variety of hazardous organic chloroalkane solvents.…

A: Solution: x (x-x) (x-x)2 1.18 0.2362 0.05579 1.35 0.4062 0.164998 0.57 -0.3738 0.139726…

Q: x 1.8 2.3 6.7 11.3 16.7 25.2 26.9 27.9

A: Percentile is the value in the data set below which certain percentage of the data lie.   The…

Q: Measure the significance of the difference in the height of Chris's friend before and now with a…

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Q: Find the z-score boundaries that divide a normal distribution as described in the following. The…

A: Solution: From the given information, 70% area lies in the middle of the normal distribution and 30%…

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.