Constructa90%confidenceintervalforthetruemean,?,ofapopulationwithanormal distribution if a random sample of size ? = 75 has a mean of ?̅ = 12.5 and standard deviation ? = 0.9

Q: The average baptismal cost includes 50 guests. A random sample of 32 baptismal during the past year…

A: Given n=32 x¯=53s=10α=0.05

Q: The percentage of metal alloy used in metal casting is measured in 41 random selected parts. The…

A: Solution

Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…

A:

Q: If the mean time spent doing this homework assignment was 47.3 minutes with a standard deviation of…

A: Mean = 47.3 Standard deviation = 5.8

Q: The Cleaning Institute conducted a survey in 2009 of 865 adults asking each adult the number of…

A: Given information Sample size (n) = 865 Sample mean x̅ = 8.726 Standard deviation (s) = 6.611…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: Given ,  Population mean = μ = 13 years Population standard deviation = σ = 1.8 years Sample size =…

Q: What is Standard Deviation? Can it be robust to outliers?

A: Standard deviation is the measure of the spread of the dataFormula for population standard deviation

Q: The time a patient must wait before being attended by a physician in a hospital has been observed…

A: Hypothesis Testing: It is basically a comparison of the statistical measures of the data with one…

Q: There is a study to be done on the mean duration of phd students at small universities. What is the…

A: The standard deviation is 42 months, the margin of error is 12 months and confidence level is 99%.

Q: study on a sample of 60 pregnancies produced a mean of 265 days and a standard deviation of 15.5…

A: Given that  Sample size = 60 Mean = 265 , Sample standard deviation = 15.5

Q: Homesafe Associates Real Estate, Inc.  advertises the mean selling time of a residential home is 40…

A: From the provided information, Sample size (n) = 49 Sample mean (x̅) = 45 Sample standard deviation…

Q: The average time spent commuting to work for a sample of 15 individuals in a city isfound to be 28…

A: The objective of this question is to calculate the 75% confidence interval for the true mean…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 2…

A: The hypotheses for the test is given below.Null hypothesis:H0: µ = 13Alternative hypothesis:H1: µ ≠…

Q: Sample of 43 Foregin language movies made since the year of 2000 had a mean length of 112.5 minutes…

A: From the provided information, Sample size (n) = 43 Sample mean (x̅) = 112.5 minutes Sample standard…

Q: Suppose that a garage samples 20 customers. They find the average time for there oil change is 4,029…

A: The objective of this question is to find the upper bound of the 90% confidence interval for the…

Q: An investigator conducts a study to investigate whether there is a difference in mean PEF in…

A:

Q: From the scores in subject EQT203 for 8 students, it was found that the mean score is 73 and the…

A: We have given that, Sample mean (x̄) = 73, sample size (n)= 8 and standard deviation (s) = 5.15…

Q: Please calculate a 95% confidence interval with a single sample mean 45, sample size of 30, and…

A: Given that  Sample size n =30 Sample mean =45 Sample standard deviation =5.4

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.338.33…

A: Given: Mean,  μ = 8.33 Standard deviation, σ = 1.48 Concept: The empirical rule states that:…

Q: Do male and female servers work the same number of hours? A sample of 29 female servers worked an…

A:

Q: A recent research study reported that the mean daily internet usage among preparatory school…

A: From the provided information, Sample size (n) = 22 Sample mean (x̄) = 125 Sample standard deviation…

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.358.35…

A: The provided information are: Population mean (µ) = 8.35 Population standard deviation (σ) = 1.46

Q: A sample of 57 observations for alcohol levels randomly taken on Highway 6 at 3am on Saturday,…

A: sample size(n)=57Mean()=0.057Variance()=0.006724confidence level=90%standard deviation()=

Q: Mulungushi University MPA/MIRD students have an average MPA/MIRD 802 test one score of 1,020. From a…

A: Given μ=Mulungushi University MPA/MIRD students have an average  μ=802 σ= Standard deviation=144…

Q: Scores on a particular standardized test are approxmimately normally distributed with mean of 21 and…

A: Given information Mean=21, standard deviations σ=5

Q: Golf balls must meet a certain standard of distance traveled in order to be used in a professional…

A: Standard normal distribution:The standard normal distribution is a special case of normal…

Q: A random sample of 31 Hollywood movies in the last 10 years had a mean length of 125.2 minutes with…

A: Obtain the 98% confidence interval for the true mean length of movies. The 98% confidence interval…

Q: A study conducted a few years ago claims that the adult males spend an average of 10.5 hours a week…

A: Givensample size(n)=50Mean(x)=12standard deviation(s)=4.2α=1%=0.01

Q: A random sample of 46 adult coyotes from Northern Minnesota showed the average age to be 1.13 years…

A: Given that:n=sample size=46σ=population standard deviation=1.13μ=population mean=1.75X=sample…

Q: The percentage of metal alloy used in metal casting is measured in 41 random selected parts. The…

A: Given information- Sample size n = 41 Sample standard deviation s = 0.42 Confidence level = 0.95…

Q: times to work, It was found that the population standard deviation is 9.2 minutes. Find the margin…

A: It is given that Sample mean = 34.5Population standard deviation = 9.2Sample size = 8Confidence…

Q: A random sample of 300 ATM transactions at the Last National Bank of Flat Rock revealed a mean…

A: given data sample size (n) = 36sample mean ( x¯ ) = 64.2sample standard deviation (s) =10.595% ci…

Q: The mean age of De Anza College students in a pre thinks the mean age for online students is older…

A: Given, sample size (n) = 56 sample mean (x̄) = 29.4 sample standard deviation (s) =2.1 population…

Q: The mean time spent on studies of all students at a university last year was 40 hours per week. This…

A: Solution-: Given: μ0=40,σ=13.85,x¯=42.1,n=35 Here, σ- is known so we use Z-test We compute…

Q: What is the standard deviation of a binomial distribution with 50 trials and p = 0.4?

A:

Q: Although many people think they can put a meal on the table in a short period of time, a recent…

A: The objective of this question is to determine whether there is statistical evidence that the…

Q: Asample of 14 ramdomly selected commuters in Chicago showed the average of the commuting times was…

A: Given, n = 14 mean = 33.2 Standard deviation = 8.3 Since, the confidence level is not given so let's…

Q: Researcher concluded that the average sleep of people get is more than 7 hours during weekends. A…

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

Q: A study revealed that the average time for a university graduate to find a job was 7.4 months, with…

A: Given information Sample size(n) = 64 Sample mean x̅  = 7.4 Population standard deviation = 1.35…