Use the formula to find the standard error of the distribution of differences in sample means, x¯1-x¯2. Samples of size 115 from Population 1 with mean 94 and standard deviation 14 and samples of size 85 from Population 2 with mean 75 and standard deviation 17 Round your answer for the standard error to two decimal places. standard error = Enter your answer in accordance to the question statement

Q: The standard deviation of the mean is less than the sample standard deviation because it estimates…

A: Given that True or False  The standard deviation of the mean is less than the sample standard…

Q: Suppose the population of IQ scores in the town or city where you live is bell-shaped, with a mean…

A: Solution-: Let, X= the population of IQ scores in the town Given: We find mean and standard…

Q: Dairy cattle are cattle that are bred for their ability to produce large quantities of milk.…

A: we need to input the provided data into a dataset. Let's assume the dataset is named "CattleData"…

Q: 6. A random sample of 400 married couples was selected from a large population of married couples. •…

A: Probability is a concept of statistics that deals with the study of a chance of occurrence. This is…

Q: Mean 255, x is 230 and z score is -2 find standard deviation

A:

Q: The three numbers 7,9, 14 have a sum of 30 and therefore a mean of 10. Use software to determine the…

A: In statistics, there are two types of measures namely measures of central tendency and measures of…

Q: Fit in a straight line the following tabular data, which shows the weight in "kg" and the height in…

A: The sample data of 10 children along with heights and weights is given. Treat height as independent…

Q: When data is normally distributed the mean equals the median True False

A: Normal distribution

Q: , calculate the z score

A: The z score ia defined as Z = (X - mean)/SD

Q: Run an appropriate test to compare variance between x1 and x2. What is the name of the test you…

A:

Q: Q3. Consider the following exam scores of all students in a class. 39, 15, 27, 21, 33, 24, 18, 36,…

A: Given data :  39,15,27,21,33,24,18,36,42,30

Q: The standard error of the mean is the standard deviation of a theoretical sampling distribution. the…

A: We know that- Standard error of the mean is given by- SE=σn

Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

A: The sample mean and the standard deviation are μ = 80 and σ = 12 respectively.Let X denotes the…

Q: Which bird is faster: Flamingos or peacocks? A study was done to estimate the true mean difference…

A: We have to find the confidence interval for difference in the mean running speed for all flamingos…

Q: A negative z-score indicates that the score or value is above the mean. True or False

A: Given: z-score

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

A: For two independent random sample from the normal distribution, the test statistic is calculated…

Q: The director of research and development testing and new drugs she wants to know if there's evidence…

A: Test statistic:Denote μ as the claimed mean; μ = 384. In a random sample of n = 79, the sample mean…

Q: uppose you have a data set of size of 26 with mean 50 and standard deviation 8. If u subtract 8 from…

A:

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: tandard error of the mean is used in the

A: Given that  Estimated Standard error of the mean  We know that  Standard error of the mean is used…

Q: The formula for the standard error (standard deviation of the distribution of sample means) implies…

A: Standard error is approximately equal to standard deviation,it is a part of inference statistics. It…

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: The standard error of the mean is smaller when N = 20 than when N = 10. is it true or false?

A: Standard error for the test statistic is given by- Since n is inversely proportional to standard…

Q: If you chose to compute a mean for a variable, which measure of variability would you most likely…

A:

Q: What formula is used to find the standard error of mean?

A: we have to give correct formula to find standard error of mean.

Q: random sample of about 1000 people to estimate the mean of some quantity over a population of…

A: A confidence interval estimate is an interval estimate that includes the unknown population…

Q: O E atistic is | (Round to two decimal places as needed.)

A: For medium lead level: sample size (n1) = 11 sample mean (x̄1) = Σx1 /n1 =999/11 = 90.82 sample…

Q: Do I have to take many samples from my population to create a sampling distribution of the mean in…

A: Basics of sampling distribution of mean:The sampling distribution of the sample mean is essentially…

Q: How does the curve change when the standard deviation is the same and the mean changes?

A: The mean is the center of symmetry of a curve or normal density curve.

Q: A positive z-score indicates that the score or value is below the mean. True or False

A: We want to tell you above statement is true or false

Q: You are going to convert raw score to z scores of -2, -1, 0, + 1, +2. The raw score is 8, 10, 17,…

A: We have given that the raw score is 8, 10, 17, 22, 6, 20, 21, 22, 19, 30. z-score = ( X-Mean )/S.D

Q: Find the variance and standard deviation of the given set of data to the nearest tenth. {530, 150,…

A: As we know that varience is of set of data V(x)=1n∑i=1nxi-μ2  and standard deviation is SD=V(x)

Q: It is possible to have a standard deviation of -1 for some data set? True or False

A: See the below solution

Q: Find the standard error for comparing the means.  Construct a 95% confidence interval for the…

A: The sample mean of the body dissatisfaction assessment score was 13.4 (s=7.9) for 15 lean sports…