Q2// two groups of students performed an exam and their grades were as: Group A : 70, 70, 70, 70, 85 , 85 Group B : 70, 72, 73 , 75 , 75 , 85 Use standard deviation to compare between the groups.
Q: What is the standard deviation of the following: 49, 50, 13, 11, 15, 21 Round to 2 decimal places…
A: Solution
Q: What is the z score for 20 if mean =28 and stadnard deviation =6
A: The z-score of a random variable x is defined as follows: z = (x – µ)/σ. Here, µ and σ are the mean…
Q: Find (a) the range and (b) the standard deviation for the sample
A: We have given that the data in tabulation form. Range: The difference between the maximum value to…
Q: In 2019, College Board reported that the mean score for the math section of the SAT was 521 with a…
A:
Q: Police departments use exams as part of their promotion process where officers have to score higher…
A: It is given that the mean score of all officers taking the exam (mu) is 62, and the standard…
Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…
A: let X: The lengths of the steel rods.X has normally distributed.X~N(μ,σ)where mean(μ)=148.4 cmand…
Q: What is the standard deviation of the following sample data: 21, 10, 37, 38, 11, 22. Round to 2…
A: We have given that, The data set is, 21, 10, 37, 38, 11, 22 Then, We will find the standard…
Q: How do I interpret the 6 charcteristics of data when I am only given the mean, median, mode, and…
A: According to the provided information, mean, median, mode, and standard deviation are given.
Q: What is the standard deviation of a dataset with the following values: 10, 12, 15, 18, 20?
A: Standard deviation is a measure of the amount of variation or dispersion of a set of values. A low…
Q: 2. The width of white board markers manufactured by a company is approximately normally distributed…
A: 2 a. Obtain the sampling distribution of the sample mean. The sampling distribution of the sample…
Q: Suppose that Sacramento workers have a mean commute of 17 minutes and commute times are normally…
A:
Q: The height of men is a normally distributed variable with a mean of 68 inches and a standard…
A: Mean(μ)=68Standard deviation(σ)=3
Q: For the given set of data: (98, 56, 59, 56, 73, 67, 67, 67, 70, 64} Determine: (a) Mean (b) Median…
A: Given data is 98,56,59,56,73,67,67,67,70,64Arrange the data in ascending…
Q: What is the standard deviation of the following: 49, 14, 13, 41, 11, 50
A: Calculate Sample Standard deviation (S) from the following data49,14,13,41,11,50Solution: x x^2…
Q: What is the standard deviation of the following: 38, 36, 49, 36, 43, 35
A:
Q: At Center Hospital there is some concern about the high turnover of nurses. A survey was done to…
A: Given data for 20 nurses were as follows. 5, 8, 10, 11, 11, 14, 15, 17, 23, 26, 26, 28, 29, 30, 31,…
Q: What is the standard deviation of the following: 23, 41, 22, 37, 48, 36?
A: We have given the data set and we have to find standard deviation. Now, Now, variance-
Q: Q4) Data of 100 student scores was recorded in a statstistics exam. The arithmetic mean and standard…
A: Given n=1000, sample mean x̄=60, standard deviations=15
Q: Suppose that another sample of resting heart rates for five Math students was obtained: 72, 68, 66,…
A: From the given data we want to know the data value .
Q: Match each data set to its likely standard deviation. {20, 36, 45, 49, 60, 67, 69, 72, 78, 80, 83,…
A: Given data is :
Q: A random sample of 84 products is selected and sample mean and standart deviation are found to be…
A: We have to find level of confidence.
Q: What is the standard deviation of 2,3,3,4,6,7,8,8,9,10
A: The question is about measures Given : Data : To find : Value of std. deviation
Q: The results of a common standardized test used in psychology research is designed so that the…
A: Let us define a random variable x denoting test score used in psychology research which has;…
Q: At Center Hospital there is some concern about the high turnover of nurses. A survey was done to…
A: Data:3, 6, 8, 9, 9 12, 13, 15, 21, 24, 24, 26, 27, 28, 29, 30, 32, 37, 37, 43 Using online…
Q: The incubation time for Rhode Island Red chicks is normally distributed with mean of 22 days and…
A: From the provided information, Mean (µ) = 22 Standard deviation (σ) = 3 Sample size (n) = 1000
Q: What is the sample variance and standard deviation for the data set 9,10,11,33,4 ? Show all work.
A: Given data(x) : 9,10,11,33,4 n = 5 x x2 9 81 10 100 11 121 33 1089 4 16 ∑x=67…
Q: 3) A sample of 10 students scored the following grades: 15, 19, 17, 39, 33, 20, 18, 37, 31, 35.…
A: 3) i) To find the median we arrange the data first 15 17 18 19 20 31 33 35 37 39…
Q: researcher asks six (6) families how many times they ordered delivery from Amazon in the last six…
A: The given values are 6, 9, 2, 12, 6, and 5. It will consider as a population. The population size is…
Q: large chemistry course took their final exam. The mean was 75 with a standard deviation of 8. a)…
A:
Q: A set of data item is normally distributed with a mean 208 and a standard deviation of 48. Find the…
A:
Q: What is the type of test you will use? (z-test, single-sample t-test, paired-samples t-test, or…
A: to find A). What is the type of test you will use? (z-test, single-sample t-test, paired-samples…
Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…
A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…
Q: A government board examination has a mean score of 500 points. A review school promises improved…
A: Let μ denotes the population mean score. The government board examination has a mean score of 500…
Q: What is the standard deviation of the following: 50, 34, 41, 43, 30, 50
A: Calculate Population Standard deviation (σ), Sample Standard deviation (S) from the following…
Q: Which distribution should you use for this problem? (Enter your answer in the form z or tar where df…
A: Part (c) It is clear that population standard deviation is unknown indicating that tdf distribution…
Q: A random sample of 10 baseball players is taken to determine the characteristics of player's…
A:
Q: The results of a common standardized test used in psychology research is designed so that the…
A:
Q: What is the standard deviation of 1,1,1,2,3,3,
A: It is given that the sample 1,1,1,2,3,3,3
Q: What percent of the students received a score below 64, if the mean grade on a test was 70 and the…
A:
Q: what is the standard deviation for 12,10,15,12,20
A: X (X-xbar)^2 12 3.24 10 14.44 15 1.44 12 3.24 20 38.44
Q: ore is needed to be in the top 8%? Mean is 90 Standard Deviati
A: Let the left area of the normal curve is denoted by -z* and the right area of the curve by z*. Now,…
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- In 2019, College Board reported that the mean score for the math section of the SAT was 528 with a standard deviation of 110. A math department at local university would like to give a scholarship to any student that scored in the top 2.5% of students in the math section. What is the minimum score needed to get this scholarship? Assume the scores are normally distributed. A/boulder 10k race was 1.78 standard deviations faster than women's average group. 405 women ran , assuming normal distribution, how many women ran faster than joan?The researcher needs to determine if girls on average score higher than 600 in the exam. The information that the standard deviation for girls’ scores is 100. The data of 20 girls was collected by using random samples and record their marks which are as underScore: 650, 730, 510, 670, 480, 800, 690, 530, 590, 620, 710, 670, 640, 780, 650, 490, 800, 600, 510, 700
- What is the standard deviation of the data {7, 1, 7, 10, 5, 3, 2}?A large chemistry course took their final exam. The mean was 75 with a standard deviation of 8. What are the exam scores that separate the top and bottom 5 percent of the class (extreme 10%)? What are the exams scores that separate the middle 10% of the class (5% on each side of the mean)? What proportion of people scored in the A range (90 or above)? What proportion of people failed the exam (60 or beloA company conducted a survey on the number of hours employees spend on a particular task per week. The data collected from a sample of 10 employees are as follows: 5, 6, 7, 8, 9, 10, 10, 11, 12, 13. Calculate the standard deviation of the hours spent on the task per week.
- Find out mean deviation from mean by applying direct method from the following distribution: Values: 48, 50, 46, 44, 40, 42, 35, 30, 20, 15.A local community college reported that the average SAT score of its students is 960 with a standard deviation of 82. If a student scored 975 on the SAT, what is the student's z score? Did the student do better or worse on the SAT compared to the average student in the college?The honors program at Brad's university only accepts students with an entrance exam score over 400. What percentage of students would be eligible if the students at Brad's school have an average exam score of 250, with a standard deviation of 80?