An IQ test is designed so that the mean is 100 and the standard deviation is 20 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 95% confidence that the sample mean is within 7 IQ points of the true mean. Assume that o=20 and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation. The required sample size is (Round up to the nearest integer.) HEDD

Q: A retail store is considering adding a new product line to its inventory. The store wants to know…

A: Sample size, N = 125favourable cases, x=70Confidence level, cl = 0.90level of significance,  = 0.10

Q: 12. The red blood cell count for a population of adult males can be approximated by a normal…

A: We have given that  X~N( μ , ?^2 )    μ = 5.4    , ? = 0.4   Z-score =( x - μ )/?  ,

Q: You must do all of your calculations on the TI calculator. DO NOT Use the Stats -> Tests for any of…

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…

Q: Determine the weight of the students before and during the quarantine. Did the students lose more…

A: H0:μ1=μ2H1:μ1<μ2

Q: A population of 2000 rods has a mean length 200cm and standard deviation 20cm. What is the mean and…

A:

Q: Each person in random samples of 237 male and 293 female working adults living in a certain town in…

A: Given: For male: n1 = 237 X1  = 31.6 s1 = 24 For female: n1 = 293 X2  = 29.3 s2 = 24.3 Formula Used:…

Q: The class mean for the exam was 82 with a standard deviation of 6.  There are 37 students in the…

A: We have given that, Mean = 82 , standard deviation σ = 6  sample size n = 37   Standard error of the…

Q: If the Mean of a data set is 700 and the Variance is 49; Calculate the intervals used for the…

A: Given information, Mean of a data set = 700 Variance = 49 We have to calculate intervals using…

Q: A sample of 90 items has mean 55 and standard deviation 3. A second sample of 110 items has mean 60…

A:

Q: Compute the standard scores for the values 0.49, 0.18,and 0.90. Interpret these scores. What…

A: This question involves computing and interpreting standard scores (also known as z-scores) for given…

Q: if E=0.07 and population standard deviation=0.8 then find the sample size for 99% confidence…

A: Margin of error(E)=0.07 population standard deviation(σ)=0.8 confidence level=99%

Q: A statistics test has a mean of 60 and a standard deviation of 10 while an accounting test has a…

A: Given information Statistics test Mean µ = 60 Standard deviation σ = 10

Q: The population has a mean of 14 and a standard deviation of 3. The sample size of your sampling…

A:

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 variance of a population is 6. the size of the sample collected from a population is 228 What is…

A: Variance of population=S2=6, Sample size=228

Q: The variance of a population is 8. the size of the sample collected from a population is 328 What is…

A: Answer: From the given data, Variance (σ2) = 8 Sample size(n) = 328

Q: The mean and variance of population with sample size is 100 is 20 and 4 respectively.Calculate the…

A:

Q: Determine the sample size required to estimate the mean score on a standardized test within 2 points…

A: Given Margin of error=2 S=18 Z=1.96

Q: Which of these statements is best?       The variable to be predicted is the independent variable.…

A: Which of these statements is best?       The variable to be predicted is the…

Q: Assume that population mean is to be estimated from the sample described. Use the sample results to…

A:

Q: For any quantitative population with a finite variance, the proportion of data points less than 2…

A: Given :- For any quantitative population with a finite variance, the proportion of data points less…

Q: Differentiate between qualitative and quantitative data with examples. What are the limitations of…

A: Qualitative research is aimed at gaining a deep understanding of a specific organization or event,…

Q: If research samples 28 college students and wants to compare the sample mean of 8 to the population…

A: From the provided information, Sample size (n) = 28 Sample mean (x̄) = 8 Population mean (µ) = 12…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

Q: Assume that a sample is being used to estimate a population mean μμ. If n = 19, x¯ = 43, and s = 3,…

A:

Q: The standard deviation of the sample mean is less than the standard deviation of the population.…

A:

Q: construct the normal model for data with a mean of 57 and a standard deviation of 6. Show the…

A: It is called empirical rule.  Given, Mu= 57 Sigma = 6

Q: The variance of a population is 5. The size of the sample collected from a population is 225. What…

A: Answer: From the given data, Variance (σ2) = 5 ⇒Standard deviation (σ) = Variance = 5…

Q: Find the sample size required to estimate the percentage of statistics students who take their…

A:

Q: large population of 5,000 students take a practice test to prepare for a standardized test. The…

A: Population mean, Population standard deviation,

Q: Assume that the population has a normal distribution. Thirty randomly selected students took the…

A:

Q: You would like to estimate the variance and standard deviation for credit scores based on FICO.…

A: Construct the 95% confidence interval estimate for the variance of credit scores Obtain the critical…

Q: The distribution of sample means will always be normal if taken from a normal population. True or…

A: We know that if population is normally distributed then the distribution of sample means will always…

Q: Assume that population mean is to be estimated from the sample described. Use the sample results to…

A: Given information Sample size (n) = 49 Sample mean x̅ = 55.1 Standard deviation (s) = 4.8…

Q: How do I use Excel to calculate the SAMPLE STD DEVIATION of a column?

A: Standard deviation: The standard deviation indicates by how much each observation differs from a…

Q: What should the minimum IQ score be so that 90% of all students in the area can qualify for…

A: The value of z at the lowest 90%, i.e., corresponding to the left to the 90% area (p=0.90) of the…

Q: Use Chebyshevs rule and the empirical rule to describe the distribution of this data set. Count the…

A: The values are given of size 14. Sample size (n) = 14