2) A population has μ = 100 and σ = 20. If you select a single score from this population, on the average, how close would it be to the population mean? Explain your answer.

Q: A sample of size 80 which found to contain 21 smokers. What is the sample proportion of non-smokers…

A: A population is the complete set of elements for which the study or experiment is conducted. A…

Q: Compare the means of each group (ASPD and no ASPD). What can you say about the narcissism scores of…

A: Given information: The output of descriptive statistics is given.

Q: A geologist weighs a rock several times on a sensitive scale. Each time, the scale gives a slightly…

A: A geologist weighs a rock several times on a sensitive scale. Each time, the scale gives a slightly…

Q: One sample has n = 6 and M = 10. A second sample has n = 4 scores with M = 15. If the two samples…

A: Combined mean = n1x1¯+n2x2¯n1+n2

Q: If the critical value of t is 2.303, and the sample size is 13. Find the significance level (a).

A: we want to find value of alpha

Q: If a researcher reports a t-statistic with degree of freedom 19, how many individual subjects…

A: Given: Degree of freedom = 19

Q: Suppose we would like to know the difference between the true proportion of females and males who…

A: The z- test for two sample proportions can be defined as a statistical technique that can be used to…

Q: A sociologist wants to know the proportion of adults with children under the age of 18 that eat…

A:

Q: A researcher measures eye color for a sample of n-50 people. Which measure of central tendency would…

A: Here the characteristic which is to be measured is eye color, which is not a numerical value.

Q: A medical researcher wants to begin a clinical trial that involves systolic blood pressure (SBP) and…

A: The appropriate test for the given problem is Correlation analysis. Correlation is used to determine…

Q: If we have measurement error in our data, and those errors are truly random, what will the average…

A: Average =Sum of errorsNumber of errors

Q: If all possible random samples of size =45 are selected from a population with μ=69 and a σ=6, and…

A:

Q: What is STANDARDIZED EFFECT estimates Cohen’s d?

A: Cohen’s d is an effect size which is used to indicate the difference between two sample means…

Q: If the size of a sample is 64 and standard error of mean is 1.5.What should be the sample if…

A:

Q: One of the most feared predators is the great white shark, which can grow to a mean length of 21…

A: Given, population mean (µ)  = 21 sample size (n) = 3

Q: What are the assumptions needed for testing two population means from independent samples?

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: What proportion of 20% defective shipments will be accepted?

A: Given : N=50 , n=5 , p=0.20 , M=N*p=50*0.2=10 Here , X​​​​​​​Hypergeometric (n=5,N=50,M=10) The…

Q: Suppose that we wanted to estimate the true average number of eggs a queen bee lays with 99%…

A:

Q: At the particular courthouse, to increase his or her honor's statistical power, a judge can 1.…

A: Power of the test: Power of the test is defined as the probability of rejecting the null hypothesis…

Q: When we estimate to the population from sample data (as we do with inferential statistics), why are…

A:

Q: If I have a sample of people’s ages, and the IQR is 20, what does this mean?

A: Given:  IQR for sample of people's ages is 20.

Q: A simple random sample of 28 observations was taken from a large population. The sample mean equaled…

A: It is given that, a simple random sample of 28 observations was taken from a large population with…

Q: For a sample of 9 with a mean of 5994. How would i find the EX?

A:

Q: A new quality-inspection program is being tested to see if it will reduce the proportion of parts…

A: A sample of 200 parts that passed inspection under the new program and the number of defectives will…

Q: In how many ways can a statistician select a sample of 15 people from a population of 90 people?

A: Given,A statistician select a sample of 15 people from a population of 90 people.

Q: From a sample of 500 items, 30 were found to be defective. The point estimate of the population…

A: The point estimate of the population proportion is the sample proportion. The formula for point…

Q: If you draw a random sample of 100 scores from a large population of test scores and compute the…

A: As we increase z value, corresponding probability of occurence decreases. hence, The event among…

Q: A population of N = 6 scores has ΣX = 42. What is the population mean?

A: Given ,Population of N=6 scoresand Σx =42

Q: a. If a constant c is added to each xi in a sample, yielding yi = xi + c, how do the sample mean and…

A: Mean: For a set of n observations, x1, x2, ... , xn mean is defined as, Median: For a frequency…

Q: group of children are surveyed about their favorite snacks . The results of the survey are shown…

A:

Q: Given your decision, what type of error could you be making? Use data from Experiment 1 to answer…

A: STM capacity has, population mean , m = 7 items and population sd, s = 2 items.  A random sample of…

Q: 10. In two large populations there are 30% and 25% respectively of fair haired people. Is This…

A: Given that  For first population  p1=30%=0.30 Sample size n1=1200 For second population  p2=25%=0.25…

Q: Suppose you wish to estimate a population mean based on a random sample of n observations, and prior…

A: The population standard deviation is 12.7, the margin of error is 1.6 and probability(or confidence…

Q: group of children are surveyed about their favorite snacks . The results of the survey are shown…

A:

Q: Provide a scenario for which you would use an independent sample t test. Also, explain in your own…

A: Introduction :-  Here we have to explain  Condition where independent sample t test can be applied…

Q: A researcher measures eye color for a sample of n = 50 people.  Which measure of central tendency…

A:

Q: It is known that the population variance equals 522. What is the sample size that needs to be taken…

A: It is given that:

Q: A researcher selects all of the possible samples with n = 8 scores from a population and computes…

A: The mean of the sampling distribution of the sample mean is an unbiased estimator for population…

Q: If random samples, each with n = 16 scores, are selected from a normal population with µ = 100 and σ…

A: Here, the known values are n = 16 scores, µ = 100 and σ = 20.

Q: Assuming statistical testing was performed, what three items should be on every chart (in small…

A: A hypothesis test is carried out on the null hypothesis to determine if we have sufficient evidence…

Q: To estimate the population mean µ with a 85% error margin of 2.5 units, 10) one has determined that…

A:

Q: A researcher reports an F ratio = (5, 9), repeated-measures ANOVA, how many treatments were compared…

A: A researcher reports an F-ratio with df=5,9 from a repeated-measures ANOVA.  Let there are k…

Q: It is claimed that the mean household size in the River Terrace neighbourhood is 3.5 persons. A…

A: Test is that whether the mean household size in the River Terrace neighbourhood is 3.5.

Q: A study was conducted to examine how anxiety (measured on a metric scale) varies for people from…

A: Mixed ANOVA: Mixed ANOVA is also treated as the split-plot ANOVA. Mixed ANOVA technique is used for…

Q: Fifty people are selected randomly from a certain population and it is found that 12 people in the…

A: Sample size = n = 50 Sample number of events = x = 12 Sample proportion = p̂ = x/n = (12/50) =…

Q: If a treatment is expected to decrease scores in a population with µ= 30, then the alternative…

A: If a treatment is expected to decrease scores in a population with µ= 30, then the alternative…

Q: In a class of 31 students, how many would be above the third quartile?

A: From the above data  Sample size n=31 How  many would be above the third quartile?

Q: Because of the popularity of movies as an entertainment medium for college students, you plan to do…

A: Solution: Given information: Population standard deviation= σ= $0.50   Margin of error = E= $0.25…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.