Q3 Find an estimate of the variance and standard deviation of the following data in Table 1 for the marks obtained in a test by 88 students. TABLE 1: Students marks Marks (x) 0

Q: Preventing heart attacks: Medical researchers performed a comparison of two drugs, clopidogrel and…

A: we have given that  For sample 1, we have that the sample size is N_1= 6661n1​=6661, the number of…

Q: Suppose that a category of world class runners are known to run a marathon (26 miles) in an average…

A: The random variable X is the average of the 49 races. The mean is 142, and standard deviation is 13.…

Q: Let X1, ... , Xn be identically and independently distributed with population mean 7.4 and standard…

A: Given that, X1, ...., Xn are iid with mean 7.4 and standard deviation 0.94 n=20 We know that ,

Q: Find the mean and standard error of the mean of the sampling distribution. Then sketch a graph of…

A: Sample size(n)=25mean()=$232Standard deviation()=$63

Q: Q4. (a) Find the Variance, Standard deviation and coefficient of variation for the following data.…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: The mean TOEFL score of international students at a certain university is normally distributed with…

A: The provided information is µ=490 σ=80 n=30   The mean and standard deviation for the sample means…

Q: Researchers measured the waist sizes of 230 men in a study on body fat. The true mean and standard…

A: Suppose researchers measured the waist sizes of  men in a study on body fat. The true mean:…

Q: Suppose the prevalence of type II diabetes in a community is 36%. Researchers want to sample 16…

A:

Q: A statistics teacher taught a large introductory statistics class, with 500 students having enrolled…

A: Given Information: Total number of students enrolled= 500 The mean score of those students in there…

Q: Q / The following data represents the distribution of weekly expenditures for a random sample of…

A: The mean deviation of a frequency distribution for any average is defined by where A is the mean or…

Q: A simple random sample of 100 observations was taken from a large population. The sample mean and…

A: Given that ,                    sample size n=100                    Mean u=80…

Q: ed in the table. = 0.0804 and the standard deviation of the differences is xdif = fference in the…

A:

Q: An original population of scores with a mean = 50 and SD = 6 is standardized to create a new…

A: given data  1 represents original population 2 reperesents new distributionμ1 = 50μ2 = 80σ1 = 6σ2 =…

Q: A simple random sample of 64 observations was taken from a large population. The sample mean and the…

A:

Q: Prestigious University desires to accept only the top20% of all graduating seniors based on the…

A: Given: μ=500σ=100 The z- value is obtained as below:…

Q: Let (x-bar) be the mean of a random sample of size 60 drawn from a population with mean 120 and…

A:

Q: Listed in the data table are 1Q scores for a random sample of subjects with medium lead levels in…

A: Given : For high lead level  x̄2 = 89.731 s2 = 9.764 n2 = 11

Q: The following data about the sales and advertisement expenditure of a firm is given below: Sales…

A:

Q: The standard error of the mean (Qx) is a(n)

A:

Q: Suppose that vehicle speeds at an interstate location have a normal distribution with a mean equal…

A: Here, µ = 70 mph and σ2 = 25 mph.

Q: Assume that an intelligence test scores are distributed normallt with a mean of 100 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: Assume that the test scores for a large class are normally distributed with a mean of 64 and a…

A: Solution-: Given: We find P(the class received a higher score than 78)=?

Q: a distribution consists of three components with frequencies 200,250 and 300 having means of 25,10…

A:

Q: The histogram displays hours of sleep per day for a random sample of 200 subjects estimate mean…

A: Given that  The histogram displays hours of sleep per day for a random sample of 200 subjects From…

Q: What is the Z score for the X value of 6 in a Distribution of 100 observations with a Mean of -10…

A: From the provided information,X value is 6.

Q: A standardized exam’s score are normally distributed. In a recent year, the mean test score was 1477…

A: Introduction: Consider X as a normally distributed random variable, with mean μ and standard…

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

A:

Q: The data shows the ages of 10 Grade 11 students. Compute : Range Interquartile Range Variance…

A:

Q: Suppose that a category of world class runners are known to run a marathon (26 miles) in an average…

A:

Q: there are 75 students in the class and 20 students are getting a+ grade in the class find the mean…

A: