8) The distribution of weekly salaries at a large company is unknown with a mean of $1000 and a standard deviati $370. What is the probability that the sampling error made in estimating the mean weekly salary for all employe the company by the mean of a random sample of weekly salaries of 80 employees will be at most $75?

Q: A leading magazine (like Barron's) reported at one time that the average number of weeks an…

A: The objective of this question is to find the probability that a sample of size n=58 is randomly…

Q: what would the mean and standard deviation of the sample proportion ˆp be?

A: Let X be Pennsylvanians who have a high school diploma Given, n = 225 p = 0.83

Q: A professor of statistics noticed that the marks in his course are normally distributed. He has also…

A: μ1=0.78, σ1=0.15μ2=0.74, σ2=0.13

Q: ple mean within the distribution.

A: samples 1st Score 2nd Score Sample Mean A 1 4 2.5 B 4 1 2.5 C 1 10 5.5 D 10 10 10 E 4 4 4…

Q: Suppose 1% of students drink more than 3 cups of coffee each day. To check this claim, a researcher…

A: Given that p = 0.01 ,n=133 What is the sampling distribution of the sample proportion? What is the…

Q: Suppose the amount of time it takes a student to complete a multiple-choice exam with 50 questions…

A: Given that.   X~N( μ , ?)   μ=60 , ?=10   Z-score =( x - μ )/?

Q: A psychologist obtains a random sample of 20 mothers in the first trimester of their pregnancy. The…

A: Denote μ as the true mean IQ of children at 5 years of age, whose mothers played Mozart for at least…

Q: Suppose the scores on a statistics exam follow a normal distribution with a mean of 70 and a…

A: GivenMean(μ)=70standard deviation(σ)=10

Q: For a population With a mean of 75 and a standard deviation of 12, what is the probability that a…

A:

Q: Suppose that the efficacy of a certain drug is 0.56. Consider the sampling distribution (sample size…

A: The objective of this question is to find the mean and standard error of the sampling distribution…

Q: 33% of the Population has 20/20 vision if 70 individuals are selected at random from the Population…

A: Sample size : n = 70P(20/20 vision) : p = 0.33x = Number of people with 20/250 visionMean of X :  =…

Q: 2. Suppose the current annual salary of all teachers in the United States have a normal distribution…

A: Given that.   X~N( μ , ?)   μ=81000     , ?=6500   Z-score =( x - μ )/?

Q: uppose you know that the distribution of sample proportions of fifth grade students in a large…

A: Given that  Sample size n =100 Mean=0.30 Standard deviation =0.08

Q: Suppose that a study of elementary school students reports that the mean age at which children begin…

A: given data normal distribution population mean (μ) = 5.3population sd (σ) = 0.7sample size (n) = 31

Q: Suppose you draw a random sample of 100 observations from a population with a variance = 25. What is…

A:

Q: Suppose the scores, on a college entrance examination are normally distributed with a mean of 1000…

A: We have given that Suppose the scores, on a college entrance examination are normally distributed…

Q: Suppose that a study of elementary school students reports that the mean age at which children begin…

A: The provided information are: Population mean (µ) = 5.7 Population standard deviation (σ) = 1.2…

Q: Suppose that we randomly select a sample of 80 measurements from an infinite population having a…

A: 1) Given: Mean μ=30 Standard deviation σ=5 Sample size n=80

Q: Find the M.L.E for the population mean in poission distribution and also find variance.....

A:

Q: The distribution of annual returns on common stocks has a mean of 9 percent and a standard deviation…

A:

Q: At a certain concert, 34 % of the audience was under 20 years old. A random sample of n = 249…

A: Given,sample size(n)=249sample proportion(p^)=0.34

Q: Suppose that the efficacy of a certain drug is 0.38. Consider the sampling distribution (sample size…

A: The objective of this question is to find the mean and standard error of the sampling distribution…

Q: What value is the probability that the mean of nine randomly selected individuals from a normally…

A: Sampling distribution of the sample mean x¯ ~ N(μx¯ , σx¯)

Q: The distribution of sample variances tends to be a distribution skewed to the right. true or false?

A: When sampling from a normal distribution, by the definition of the Chi-square variate,…

Q: About 79% of all female heart transplant patients will survive for at least 3 years. Seventy female…

A:

Q: 9. For a standardized psychology examination intended for a psychology majors, the historical data…

A: Mean ()=515standard deviation ()=175

Q: pose the horses in a large stable have a mean weight of 818lbs, and a variance of 3481.   What is…

A:

Q: Suppose that among the population of smartphone owners with 16GB of storage, the mean amount of…

A: From the provided information, Mean (µ) = 13 GB Standard deviation (σ) = 3 GB

Q: 2. If the mean and variance of a Binomial distribution are 9 and 6 respectively, find the number of…

A: Step 1: Start with the formulas for mean and variance of a Binomial distribution:Mean (μ) =…

Q: Derive the variance of the Student's t distribution.

A:

Q: Illustrate the probability histogram of the sampling distribution ofthe means. There are total of…

A: Given information: The average time of 15 minutes. Standard deviation of 6 minutes 56 athletes are…

Q: Suppose pages per book in a library have an unknown distribution with mean 297 and standard…

A: According to the given information in this question We need to find mean for the sample sum…

Q: Suppose that the height distribution of students in your class was normally distributed with mean 68…

A:

Q: It is generally believed that 49 percent of all college students complete their college careers.…

A:

Q: Suppose that the distribution for total amounts spent by students vacationing for a week in Florida…

A: Answer:- Given     X ~ N(μ, σ )                      Where mean μ   = 650        &    standard…

Q: According to PSA, the probability of a randomly selected 90-year old Filipino survives for at least…

A: Given information: n=20p(success=survive another year)=82% or 0.82q(failure= not survive another…

Q: The mean cost of a set of new set of Queen sheets having a 500 thread count is $65.40 with a…

A: We have given that, Population mean (µ) = $65.40, standard deviation (σ) = $7.41 sample size (n) =…

Q: Suppose that 65% of the 310,000 citizens in a county are registered to vote. A non-profit…

A: Given data: Proportion:p = 0.65 Sample size:n =100 To find: What is the mean and the standard…

Q: A racing car consumes a mean of 103 gallons of gas per race with a variance of 36. If 38 racing…

A: The probability of the sample mean would be greater than 101.5 gallons is 0.9382 and it is obtained…

Q: The mean number of words per minute (wpm) typed by a speed typist is 133 with a variance off 144…

A: Given that , = 133, 2 = 144 So , = 12, n = 90 Let  be the mean of sample. = 133  =  /n = 12/90=…

Q: Suppose the average amount of money that people spend on their pets per month is 47 dollars, with a…

A: From the Standard Normal table, the bottom of 30% is -0.5244. The average amount of money spent on…

Q: Suppose babies born in a large hospital have a mean weight of 3685grams, and a variance of 330,625.…

A: Given: μ=3685σ2=330625

Q: 4. The time required for all cross-country skiers to complete a race has a normal distribution with…

A:

Q: Suppose that a study of elementary school students reports that the main age at which children begin…

A: From the provided information, Mean (µ) = 5.9 Standard deviation (σ) = 0.8