z=+2.00 and x=30 corresponds to z=-1.00 what is the population

Q: If there were 760 students in Jamal’s class, approximately how many students scored higher than…

A: The probability that z-score is greater than 1.41 is calculated as follows: PZ>1.41=1-PZ≤1.41…

Q: A comprehensive survey released by a college reports that the true proportion of all students at the…

A:

Q: Suppose X ~ N (-2,3). Between what c values does 99.73% of the data lie?

A: The mean is -2 and the standard deviation is 3.

Q: Which of the following would lead to the best comparative exam score? a. x= 65, µ=60 and the σ=2 b.…

A:

Q: Based on the model, what percent of people should have IQ scores above 116? What percent of people…

A: Given a normal distribution with  mean 100 and standard deviation 16.IQ score 116 is one standard…

Q: For a population with μ = 80 and σ = 10,what is the X value corresponding to z = -0.50?

A: Given information Mean (µ) = 80 Standard Deviation(σ) = 10 Z = -0.50 Z-score is given by the…

Q: If the score of 3 courses for a student who studied at a university are 81, 62, 74 with credit hours…

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Q: After six biology test, Ruben has a mean score of 77. What score does Ruben need on the next test to…

A:

Q: In a study of over 15,000 teens, 62% of boys and 55% of girls consumed sugar-sweetened soda on the…

A:

Q: eart attack or stroke within one year, and of the ticagrelor patients, 565 suffered a heart attack…

A:

Q: John calculated r -.44 for a set of n 10 pairs of values that represent the number of absences from…

A: Given that r = -0.44 midterm exam score ( y )   number of absences from class (x)

Q: Kevin scored at the 70th percentile on a test given to 9940 students. How many students scored lower…

A: Given Kavin got 70 percentile. Total students are 9940.

Q: On a psychology exam withµ= 76 and o = 12, Tom scored 9 points below the mean, Mary had a score of X…

A: From the provided information, Mean (µ) = 76 Standard deviation (σ) = 12 X~N (76, 12)

Q: Which of the following is the correct expression for 70% of X? . For a number X, 40% of X is what…

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Q: Suppose you have information about average heights of a random sample of airline passengers. The…

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Q: Angela took a general aptitude test and scored in the 86th percentile for aptitude in accounting.…

A: Percentiles:If the elements in the data set are arranged in ascending order of magnitude, then the…

Q: Two doctors asked 6 of their patients, who were smokers, how many years they had smoked. In…

A: Correlation coefficient: Correlation coefficient measures the strength and direction of linear…

Q: The data in the accompanying table were collected from a statistics class. The first row gives the…

A: This data contain height of female ad males So, this data can be used for check men or women tended…

Q: On a psychology exam with µ = 76 and o = 12, Tom scored 9 points below the mean (M), Mary %3D had a…

A: Given, On a psychology exam with μ =76 and σ=12, Tom scored 9 points below the mean(M), Mary had a…

Q: Angela took a general aptitude test and scored in the 84th percentile for aptitude in accounting.…

A: Obtain the percentage of the scores that were at or below her score. From the information, given…

Q: In a study, the rate of success of initial vaccination among 330 subjects receiving the 1:10…

A: Given: Sample size of subjects (n) = 330 Sample proportion or success rate p^=0.971 Hypothesized…

Q: find the p value when the test statistics is -6.61, the df is 10-1, and the level of significance is…

A: Find the p value if  t=-6.61 and df=10-1=9 Level of significance alpha=0.05

Q: A student has scores of 72%, 74%, and 78% on three exams. What percent score does he need on the…

A: Here we solve the inequality for x . x= score for the fourth exam.

Q: On a test, John scored at the 50th percentile and Jim scored at the 25th percentile; therefore,…

A: A percentile indicates a score's position in relation to those other values from the same dataset.…

Q: Given x = 0, 1, 2, 3, 4, 5 how is the mean 1.5? Shouldn't the mean of x be 2.5?

A: Measures of Central Tendency: A measure of central tendency represents the central value or typical…

Q: (b) For a set of 100 observations, the sum of deviations from 4 is -11, and the sum of the squares…

A:

Q: After six biology tests, Ruben has a mean score of 74. What score does Ruben need on the next test…

A: The mean score of Ruben after six biology tests is 74.

Q: In 2015, Gary earned $25,300. In 2016, he received a raise and earned $28,100. Comparing Gary’s…

A: follow next step

Q: Bob scored at the 65th percentile on a test given to 9960 students. How many students scored lower…

A: x = no. of data value less than x  * 100/total no. of data values

Q: If there were 500 students in Jamal’s class, approximately how many students scored higher than…

A:

Q: In a random sample of college freshmen, the proportion who use text messaging daily was 0.93. In a…

A: Given, In a random sample of college freshmen, the proportion who use text messaging daily was 0.93…

Q: Con side that the ten Percent of indlividuals getting tested for the Virus, have the Virus. Now…

A: Let A be the event denoteds the person having virus and B be the event denote the event the person…

Q: The mean weight of 150 students in a class is 60 kg. The mean weight of boys in the class is 70 kg.…

A:

Q: For a raw data, the arithmetic mean is 48 and sum of the observations (values) is 240. One of the…

A: GivenArthmetic mean =48sum of observations = 240

Q: After six biology tests, Ruben has a mean score of 78. What score does Ruben need on the next test…

A: Note that, the required mean is 80. The total number of tests after the next test is 7.

Q: After six biology tests, Ruben has a mean score of 75. What score does Ruben need on the next test…

A: Let 'x' denote the score Ruben need to score on the next, i.e. seventh test so that his average…

Q: Byron is conducting an experiment to determine whether a new medication is effective in reducing…

A:

Q: What is the value of SS for this sample?

A: Given: n = 4  Σ X = 4 Σ X 2 = 32 The formula to calculate the SS is as follows:

Q: µ = 9 has Σ X = 54. How many scores are in the populatio

A: Given that   A population with mean (μ) = 9 Summation of data values  Σ X = 54   We know that Mean =…

Q: For a number X, 40% of X is what percentage of 60% of X?

A:

Q: An analyst in the real estate business is interested in the relationship between the cost of the…

A: We have provided you the solution of all parts.

Q: A student has two test scores. The difference between the scores is 8 and the mean, or average, of…

A: Given: A student has two test scores. The difference between the scores is 8 and mean, or average,…

Q: A student has two test scores. The difference between the test scores is 20 and the mean, or…

A: Suppose the two test scores of students are x and y. Given that the difference between the two test…

Q: A student has two test scores. The difference between the scores is 12 and the mean, or average, of…

A: Given: A student has  two test scores. The difference between the scores is 12. The mean or average…

Q: For each scenario below name  one categorical and one quantitative used and write the complete…

A: Categorical Variables (CV) are those variables which cannot be measured. Quantitative Variables (QV)…

Q: After six biology tests, Ruben has a mean score of 72. What score does Ruben need on the next test…

A:

Q: After taking a series of 4 classroom examinations, John obtained a mean score of 82. How much score…

A: The average score obtained by John in 4 examinations is 82. Evaluate the total obtained by John in…

Q: In a biology study, the appearance of an animal when carrying a certain gene is recorded. Assume…

A: We have to find the number of animals having Gene B.

Q: The table shows the ratios of black socks to white socks in the women's and men's department of a…

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.