Calculate the best width of a class interval for a large group of data that ranges from a low score of -15 to a high score of +29

Q: Six hundred adult Americans were asked by telephone poll, "What do you think constitutes a…

A: b. The percentage thinks that middle-class is from $25000 to $50000 is calculated a shown below:…

Q: Then the mean number (to the nearest whole number) of students who will finish the exam in less than…

A: The distribition function is defined as F(x) = P(X ≤ x)  Let p be the probability that a student…

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

A: here  histogram of  # items over 10  is given

Q: Identify the type of table that is used to group bivariate data.

A: In this case, we need to identify the type of table that is used to group bivariate data.-

Q: Then the mean number (to the nearest whole number) of students who will finish the exam in less than…

A: The distribution function is defined as F(x) = P(X ≤ x) Let p be the probability that a student…

Q: What would an outlier look like on box plot

A: Box plot diagram or Whisker’s plot is a graphical method of depicting the data by quartiles and…

Q: The correlation of the relationship between the number of reaches into the bag and the number of…

A:

Q: For 60 randomly selected college students, exam score frequency distribution was obtained. Find the…

A: Given: class limit frequency 5-10 6 10-15 12 15-20 18 20-25 15 25-30 9

Q: If a study determines the difference in average salary for subpopulations of mechanical engineers…

A: Given: A study determines the difference in average salary for subpopulations of mechanical…

Q: The mean yearly salary of employees of a company was $24,000. The mean yearly salaries of male and…

A: Given  Mean yearly salary of ma ale and female

Q: What formula is used to gain information about a sample mean when the variable is normally…

A: Sample size: It is the number of observations in a sample under consideration. By increasing the…

Q: Draw a plot that has five-number summary of 5,6,7,9,12 and an inter-quartile range of 3

A: Given data, 5,6,7,9,12 Minimum value = 5 Maximum value = 12

Q: Select the z-score that is represented by the shaded region of the distribution.

A: The z-score that is represented by the shaded region of the distribution is -0.75. That is,

Q: . For the data set (-1, –2), (1, 2), (5, 6), (7, 7), (9, 12), find interval estimates (at a 96%…

A: Given: X Y -1 -2 1 2 5 6 7 7 9 12

Q: What is the decision rule for the t-test that the mean child mortality rate for countries in Eastern…

A: It is tested that the mean child mortality rate for countries in Eastern Europe is more than the…

Q: If a study determines the difference in average salary for subpopulations of mechanical engineers…

A: The null and alternative hypotheses would be: H0:μM=μC (There is no difference between average…

Q: state two diaadvantage of displaying data in groups

A: We have to write two disadvantages ofndisplayimg data im group

Q: For a given data set X of three-dimensional samples, X = [{1,2,0} , {3,1,4} , {2,1,5} , {0,1,6} ,…

A: Outliers are the observations which lie away from all of the other observations in the data.…

Q: A scatter diagram cannot be created for more than 100 data values. O True False

A: FALSE

Q: Determine the point estimate of the population proportion for the sample provided. Lower bound:…

A: sample proportion = (Upper limit+lower limit)/2 = (0.212+0.152)/2 = 0.182

Q: A random sample of 260 workers in a high rise office building revealed that 30% were very satisfied…

A: Let the proportion of workers who are satisfied with the quality of work be p^ p^ = 0.30 (point…

Q: Calculate the relevan descriptive statistics

A: Given: Subject Before After 1 50 62 2 59 59 3 46 60 4 55 65 5 68 63

Q: Addmissions officer sampled 124 entering freshmen and found that 35 of them scored less than 530 on…

A: According to the provided information, x=35 n=124

Q: A random sample of 4000 U.S.citizens yielded 2280 who are in favor of gun control legislation. Find…

A: Given:A rondom sample of 4000 U.S citizensyielded 2280 who are in favor of guncontrol…

Q: z-score that is greater

A: we can assume it to be standard normal distribution with mean = 0 standard deviation = 1

Q: The manager of the Postal Services claims that 98 percent of their mail are delivered on time. He…

A:

Q: I need help finding unusual values from a data set.

A: Here we find that unusual values from a data set.

Q: Compute the interquartile range for the following scores that represent a continuous variable: 1, 2,…

A:

Q: Calculate the 5 numbers summary of the given data using approximation method.…

A:

Q: Assume that you have information on the size of all 45 firms, in the island of Garibaldi, that…

A: Mid point of a class interval = Lower class limit + Upper class limit2

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

A: The histogram shows number of items over 10 and its frequency.

Q: A study of new home prices was conducted in a neighborhood of 2000 homes. The median price of a new…

A: It is stated that: The number of new homes included in the study is 2000.  The median price of a new…

Q: the central limit theorem informs the numerator of the z-score for the sample means question.  True…

A: Central limit theorem: The central limit theorem states that as the sample size n becomes large…

Q: Then the mean number (to the nearest whole number) of students who will finish the exam in less than…

A: The cumulative distribution function defined as F(x) = P(X ≤ x) Let Y denote the number of students,…

Q: Using the data, estimate the proportion of new car buyers who prefer foreign cars.

A: It is given that Sample size n = 383 Numver of car buyers prefer foreign over domestic, X = 137

Q: How to determine Estimate the P-value.

A: Introduction:P-value: The P-value is the probability of obtaining a test statistic value as extreme…

Q: Find the tabular for data in five number of rows with uniform integer length of intervals. Also…

A: CI Frequency (f) Cumulative frequency 0-10 2 2 10-20 13 15 20-30 15 30 30-40 15 45 40-50 5…

Q: Paul wants to estimate the mean number of siblings for each student in his school. He records the…

A: A parameter is a number representing the entire population. Usually sample statistics is used to…

Q: what is interval data?

A: Interval data: When the data are numerical values that can be added or subtracted, but not divided…

Q: One advantage of transforming x-values (raw scores) to a-score is

A: Raw score can be converted to z score using z score formula.

Q: what information is provided by the (+/-) of a z-score?

A: The z score tells us that the how far the mean is from the data point. The formula for z score is,…

Q: 3. Classify the data with suitable class interval, hence construct a less than ogive and a…

A: to find mean valuemean = sum of observations/ count of observationsmean = (246 + 333 + 296 + 304 +…

Q: Create an example of 2 data sets with the same range and the same number of values that have…

A:

Q: Define z-score

A: It is asked to define the z-score.

Q: A clinical psychologist took a sample of four people from the population of people with anxiety…

A:

Q: An excess of high values for the cases distributed on a graph results in a positive skew in the…

A: Skewness :  It is a measure of the symmetry of a distribution. The highest point of a distribution…

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.