I want my estimate to be accurate, I want the error of pN to be small. How many people should I poll to larantee the expected squared error on pN is less than e?
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: A sample of n = 6 scores has a mean of M = 10. If one score with a value of X = 12 is removed from…
A: Given that A sample of n = 6 scores has a mean of M = 10
Q: Find the z-score for the value 69, when the mean is 96 snd the standard deviation is 5. z-score= ?
A:
Q: Hello. I appreciate any help. Thanks.
A: Standard Error of estimate:S=√MSEMean square error:The formula for the mean square error is,MSE =…
Q: When the size of samples gets larger, the standard error of the sample means…
A: Solution Since sample size (n) is inversely proportional to standard error, The standard error…
Q: A golf club currently has 350 members that pay annual dues to play golf on the course. Historical…
A: Since you have posted a question with multiple sub-parts, we will solve first 3 sub-parts for you.…
Q: How large a sample is required for you to be 95% sure that the estimate of the mean invoice is…
A: Answer: From the given data, Confidence level = 95% ⇒c = 95% = 0.95 Margin of error (E) = 3…
Q: developed. took the drug for 3 months. Blood tests showed that x 8.4 with sample standard…
A: From the provided information,
Q: A researcher wishes to see if there is a difference in the manual dexterity of athletes and that of…
A: Sample mean for athletes x¯1=89 Sample mean for band members x¯2=95 Standard deviation σ=7.4 .…
Q: "Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing.…
A: Given, Permafresh - 15,13,16,12,11 Hylite - 18,14,19,16 α = 0.02
Q: An analysis of variance produces SSb = 30, SSw = 60, F-ratio with df = 2, 15. For this…
A: From the provided information, SSb = 30 and SSw = 60 Degree of freedom (k - 1) = 2 And (n - k) = 15
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: How would you interpret a standard error of the estimate of 3.58? Each 1-unit increase in X is…
A: we have to interpret standard error of estimate 3.58 .
Q: Dwight wants to estimate the mean calorie content in beets with 90% confidence. He believes that…
A: The population standard deviation, sigma is 17. The z-critical value for the 90% confidence interval…
Q: In a population of exam scores, a score of X = 88 corresponds to z = 2 and a score of X = 79…
A: From the provided information, A score of X = 88 corresponds to z = 2 A score of X = 79 corresponds…
Q: When tossing two dice and finding the mean, X we find that has a mean or expected value, and a…
A: Here, it is known that the mean is 3.5 and a population standard deviation of 1.7078. The sample…
Q: Calculate the z-score for a raw score of 10, if the distribution's mean and standard deviation are 5…
A:
Q: A pharmaceutical company makes tranquilizers. It is assumed that the distribution for the length of…
A: ANSWER:-
Q: The sum of the squared deviation scores is SS = 20 for a sample of n = 6 scores. What is the…
A: The variance of the sample can be calculated as:
Q: The sample mean x (with a bar above) is the best point estimator of the sample mean u(mu) True or…
A: Sample mean: The sum of the all observations of sample divided by the total number of observations…
Q: isn't it should use the normal table to find z value?
A:
Q: A sample of n = 10 scores has a mean of M = 13. After one score is added to the sample, the mean is…
A: Solution-: Given: n=10,M=13 (old)We want to add one score in the sample, the mean is found to be M =…
Q: I also need the standard deviation for the above question.
A:
Q: 8. A sample of n= 16 scores has a mean of M = 40 and a variance of s? = 128. What is the estimated…
A: Sample size = 16 Mean = 40 variance = 128
Q: The average exam score is 63 with a variance of 33. Your exam has a Z score of 0.96. What is your…
A:
Q: Please also explain why you determined whether or not the results are statistically significant. A…
A: From the given information we find the solution.
Q: The estimate of the standard error of the mean is computed as?
A:
Q: On an exam with a mean of M=39, you obtain a score of X=35. Would you prefer a standard deviation…
A: Given that, Mean M =39 X=35, prefer a standard deviation of s= 2 or s=8:
Q: A teacher was interested in the number of times her students with ADHD interrupted her class each…
A: Given population mean is 25. average was µ = 27 and the standard deviation was σ = 1.2. sample size…
Q: The first three moments of a distribution about the value 2 of.the variable are 1, 16 and – 40. Show…
A:
Q: Naini, Cobourne, McDonald and Donaldson (2008) reported that a specific ratio of height to face…
A: According to the provided data, it is reported that a specific ratio of height to face length of 1…
Q: Calculate the z-score for a raw score of 10, if the distribution's mean and standard deviation are 5…
A: Given,Mean(μ)=5standard deviation(σ)=4 raw score(X)=10
Q: The EPA recommends avoiding consumption of fish species if the mercury concentration is higher than…
A: Obtain the confidence interval for the mercury concentration: The concentration in a large random…
Q: for the above i got the mean of 1, can you help me w the standard deviation and the variance
A: From the above parts Here we have Since, X ~ Binomial (n = 3 , p = 1/3) Therefore, n = 3 , p = 1/3…
Q: Consider again the birth weights of newborn babies, where the mean weight is 3290 grams and the…
A: From the provided information,Mean (µ) = 3290Standard deviation (σ) = 520X~N (3290, 520)
Q: Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing.…
A:
Q: A doctor wants to estimate the mean trigliceride level of all 20- to 29-year-old females (in…
A: Given data Margin of error (E) = 3 95% ci for μ. S = 17.1 n = ?
Q: Individuals with calcium levels in the bottom 10% of the population are considered to have low…
A: Consider X be a random variable that represent the calcium level. It is normally distritubuted with…
Q: Consider the cholesterol levels of a given population with µ = 200 and σ = 24. A sample of 9 people…
A:
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- The scores on a test are normally distributed with a mean of 150 and a standard deviation of 30. Find the score that is 2 1/2 standard deviations above the mean.When engaging in weight-control (fitness/fat burning) types of exercise, a person is expected to attain approximately 60% of his or her maximum heart rate. For 20-year-olds, this rate is approximately 120 bpm. A simple random sample of one hundred 20-year-olds was taken, and the sample mean was found to be 107 bpm, with a standard deviation of 45 bpm. Researchers wonder if this is evidence to conclude that the expected level is actually lower than 120 bpm. To determine this, we test the following hypotheses: Ho: H= 120 versus H₂ μ< 120 Suppose the mean and standard deviation obtained were based on a sample of size 25 rather than 100.How I can calculate the standard deviations of each of the two differentassets?
- i need the answer quicklyThe distribution of scores on the SAT is approximately normal with a mean of m = 500 and an SD of s = 100. For the population of students who have taken the SAT, what proportion have scores less than 400?On an exam with u=52, a person has a score of x=14, which value for the standard deviation would give this person the highest position in the class distribution?
- the statistic X defined as X = 49S 2What should we do with a small p-value?You have developed an exam to measure knowledge of biology and administered it to a large number of people. On this exam, u= 85 and o = 10. You standardize the distribution so that the new mean and standard deviation are u = 50 and o = 5 If someone takes the exam and receives a score of 73 (before the score is transformed), what will this score be once it is transformed for the new (standardized) distribution?
- Matthew wants to estimate the mean fat content of a pack of potato chips manufactured by UniBee Foods. He wants to be 90% confident that the estimate is accurate within 0.5 mg. Old records showed a 1.2 mg standard deviation. What should be the minimum sample size that he needs to construct this estimate?A medical researcher claims that the variance of the heart rates (in beats per minute) of smokers is greater than the variance of heart rates of people who do not smoke. Samples from two groups are selected and the data is given below. Using = 0.05, test whether there is enough evidence to support the claim. Smokers Non Smokers m = 25 n = 18 s = 36 s = 10How do we set an "alpha level" in science? How is this related to our comparison with a "p-value"?