According to the best available data, the standard deviation of the times spent by students doing statistics homework is 4.6 hours. What is the minimum sample size needed so that we may be 90% confident that the margin of error in the sample is no more than 0.5 hours?

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: The average percent of correct responses on the midterm last semester was 78% with a standard…

A:

Q: The Wechsler IQ test is designed so that the mean is 100 and the standard deviation is 15 for the…

A: It is given that confidence level is 0.99, standard deviation is 15 and margin of error E is 4.

Q: The Wechsler IQ test is normally distributed with mean 100 points and standard deviation 15 points.…

A: GivenMean(μ)=100standard deviation(σ)=15Bill Gates was found to have an IQ of 160 on the Wechsler IQ…

Q: adjusted. A recent sample of 20 rods produced a mean length 7.08 inches. Based on this sample, will…

A: Given : Sample Size, n = 20

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: The weights of men in their 30s are normally distributed with a mean of 190 pounds and a standard…

A: From the provided information, Population mean (µ) = 190 pounds Population standard deviation (σ) =…

Q: It seems these days that college graduates who are employed full-time work more than 40 -hour weeks.…

A: From the provided information, Population mean (µ) = 40 hours Sample size (n) = 19 Sample mean (x̅)…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Givensample size(n)=51Mean(x)=18.6standard deviation(s)=3.1significance level(α)=0.05

Q: what percent of the students scored higher than 68?

A: It is given thatMean, μ = 70Standard deviation, σ = 3Z-Score, Z = ( X - μ )/σwhere, Z be the…

Q: Please help him by finding the standard error of the mean for these data.

A: To find the standard error of the mean.Given that,

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A:

Q: It seems these days that college graduates who are employed full-time work more than 40 -hour…

A: Given information- Population mean, μ = 40 Sample size, n = 19 Sample mean, x-bar = 44 Sample…

Q: The scores on an international business entrance have a mean of 480 and a standard deviation of 90.…

A: The mean of data is given as-The standard deviation of the data is given as-

Q: The Ankle Brachial Index (ABI) compares the blood pressure of a patient's arm to the blood pressure…

A:

Q: The variance of a sample of 99 observations equals 81. The standard deviation of the sample equals?

A: From the provided information, The sample variance of 99 observations (s2) = 81

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Given that  μ=19x¯=18.4s=2.6n=46 Test statistic: ttest=x¯-μsn     =18.4-192.646     =-1.565

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Consider X be a random variable which follows normal distribution indicating the score earned on a…

Q: A somewhat outdated study indicates that the mean number of hours worked per week by software…

A: Type 1 error occurs when a null hypothesis is rejected while it is true.  Given that true mean =44…

Q: The heights of women in a particular community are normally distributed with a mean of 65 inches and…

A: We have to find given proportion..

Q: Pyramid Lake is en the Paiute andan Reservation in Nevada. The lake is famous for cuthreat trout.…

A: a)   Assume that μ is the true mean length of trout caught in Lake P.

Q: The number of combined points scored in NBA games is normally distributed with a mean of 200.6…

A: From the provided information, Mean (µ) = 200.6 Standard deviation (σ) = 6.74 Let X be a random…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Given Information: Population mean (μ) = 19 inches;  Sample mean (x¯)= 18.6 inches; Sample standard…

Q: seems these days that college graduates who are employed full-time work more than  40 -hour weeks.…

A:

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Givenaverage length of trout caught in Pyramid Lake is μ = 19 inches.Sample size = 45sample mean = x…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A:

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A: Given data is appropriate for testing of hypothesis to test t-test for single mean. because it is a…

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: The heights of two year old females is approximately normally distributed with a mean of 33.7 inches…

A: Solution: Let X be the heights of two year old females. From the given information, X follows normal…

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A: We have to test claim.

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: If the standard error,  of a sample data set is 5 and the standard deviation,  of the distribution…

A: For a population with mean µ  and standard deviation σ, the standard error is σx̅ = σ/√n, where x̅…

Q: The coefficient of variant of the height of 20 people is 15% and the weight of the same 20 mean…

A: The formula for coefficient of variation is, CV = (σ/ µ) × 100%, where σ is the population standard…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: "Since you have posted a question with multiple sub-parts, we'll solve the first three sub-parts for…

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A: The independent variable is respondents. The dependent variable is the number of hours worked per…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Note: As per our guidelines we are supposed to answer only 3 subparts of any questions so i am…