A statistician selected a sample of 20 HR managers from UAE companies. He reported that the sample information indicated the average salary of all HR managers in UAE ranges from 17,500 Dhs and 19,500 Dhs and the sample standard deviation is 2200 Dhs. He neglected to report what confidence level he had used for building the t-based interval. Assuming that salaries are normally distributed and based on the above information, what is the confidence level? (show steps)

Q: A personnel manager has found that, historically, the scores on aptitude tests given to applicants…

A: Given,8 std. dev. =24.32 n= 15 mean= 73.08 Confidence interval = (63.1586 , 83.0014) To find:…

Q: recent year, a sample of the South American Redeye Piranha was collected by fishermen on a…

A: We have given that  Sample size n =60 Sample mean =12.88 99%confidence interval. (12.09,13.67)

Q: A personnel manager has found that, historically, the scores on aptitude tests given to applicants…

A:

Q: A statistician selected a sample of 25 HR managers from UAE companies. He reported that the sample…

A: Sample size (n) = 25 Sample standard deviation (s) = 2200 Dhs Average interval (17500 Dhs and 19500…

Q: The mean systolic blood pressure for a random sample of 28 women aged 18-24 is 115.1 mm Hg and the…

A: Given: Sample size (n) = 28 Sample standard deviation (s) = 12.7 Find critical value of chi-square.…

Q: A researcher would like to estimate the mean weight of all adult male American alligators in the…

A: Givensample size(n)=80Mean(x)=522standard deviation(σ)=25Confidence level=96%

Q: A simple random sample of 32 postal employees showed their average time working for the postal…

A: Given Data : Sample Size, n = 32 Sample Mean, x̄ = 7.22 standard…

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: A study was commissioned to find the mean weight of the residents in certain town. The study…

A: Confidence interval : Confidence interval is a range of values it contains the true population…

Q: A laboratory tested 58 chicken eggs and found that the mean amount of cholesterol was 109…

A: Given Information: Sample size (n) = 58 Sample mean (x¯) = 109 milligrams Population standard…

Q: A researcher would like to estimate the mean weight of all adult male American alligators in the…

A: Sample size (n) = 105Sample mean (x̅) = 502Standard deviations (σ) = 29Significance level (α) = 1 -…

Q: In a study on​ infants, one of the characteristics measured was head circumference. The mean head…

A:

Q: A personnel manager has found that, historically, the scores on aptitude tests given to applicants…

A: Given: σ=25.6, n=12 and x=69.86. Now, use upper limit of the confidence interval to find the value…

Q: A physician wanted to estimate the mean length of time  that a patient had to wait to see him after…

A: Given: Formula used: For confidence interval

Q: The lead levels in a random sample of 35 crows in the region were measured and recorded. The mean…

A:

Q: A personnel manager has found that, historically, the scores on apttude tests given to applicants…

A: The given information is: Sample sizen=9 Population standard deviationσ=20.72 The given estimation…

Q: A fitness center is interested in finding a 90% confidence interval for the mean number of days per…

A: Given Information: Sample size n=232 Sample mean x¯=2.3 Sample standard deviation s=1.9 (b) To…

Q: The local Health Department conducted a study in 2009 of 900 adults asking each adult the number of…

A: Given Information: Sample size (n) = 900 Sample mean (x¯) = 7.946 Standard deviation = 6.567…

Q: In a random sample of 68 employees in the restaurant trade, average weekly hours worked were 56 with…

A: The provided information is n=68 x^=56s=99 The level of significance is  α=0.05 The degrees of…

Q: A study was commissioned to find the mean weight of the residents in certain town. The study…

A: Given: n=58, x=174 and s=38. Now,Degrees of freedom=n-1=58-1=57 Then, at 95% confidence level, the…

Q: A researcher has collected the blood samples of 29 individuals and found that the mean hemoglobin…

A: Given information :  A researcher has collected the blood samples of 29 individuals and found that…

Q: The American Restaurant Association collected information on the number of meals eaten outside the…

A: The given information is about the Sample size of 60 couples showed that the sample mean number of…

Q: A personnel manager has found that, historically, the scores on aptitude tests given to applicants…

A:

Q: A random sample of 75 coyotes in a region of Northern Montana showed the average age to be 2.05…

A:

Q: A survey conducted by the American Automobile Association showed that a family of four spends an…

A: n=64x=252.45s=78.50

Q: An economist would like to estimate the average household income in Martin county. The mean…

A: We have given that,  Sample mean (x̄) = $ 52590, population standard deviation (σ ) = $ 864 and…

Q: A survey taken several years ago found that the average time a person spent reading the local daily…

A: Introduction: Denote μ as the true mean time that a person spends reading the local newspaper in the…

Q: A personnel manager has found that historically the scores on aptitude tests given to applicants for…

A: N=9, Standard deviation : d = 82.4 Mean score : a = 787.9   P(a-t ˂ x ˂ a+t) = 0.95 P(a-t ˂ x ˂ a+t)…

Q: A personnel manager has found that, historically, the scores on aptitude tests given to applicants…

A:

Q: In a survey, 32 people were asked how much they spent on their child's last birthday gift. The…

A: Given:  Sample size n=32  Sample mean xbar=$49  Standard deviations (σ)=$7  To find 98% confidence…

Q: A physician wanted to estimate the mean length of time  that a patient had to wait to see him after…

A: Solution: Let X be the waiting time. From the given information, x-bar=30 minutes, s=9 minutes and…

Q: A researcher wishes to estimate the average blood alcohol concentration​ (BAC) for drivers involved…

A:

Q: According to the almanac, the mean age for a woman giving birth for the first time is 25.2 years. A…

A: Introduction: Denote μ as the true mean age of professional women giving birth for the first time.…

Q: A random sample of 174 college students was asked to indicate the number of hours per week that they…

A: In statistics, the concept of confidence interval is used for getting the probability that…

Q: At High Fashion shoe store, 23 randomly selected customers spend an average of 33.5 minutes shopping…

A: From the provided information,

Q: In a study on​ infants, one of the characteristics measured was head circumference. The mean head…

A:

Q: A state meat inspector in Iowa has been given the assignment of estimating the mean net weight of…

A: 1. The sample mean is an unbiased estimator of the population mean. Hence, in this case, the sample…

Q: The manager of a warehouse store wants to estimate the average number of laser printer toner…

A: GivenMean(x)=115standard deviation(σ)=9.8sample size(n)=37significance level(α)=1-0.95=0.05

Q: A survey taken several years ago found that the average time a person spent reading the local daily…

A: Null hypothesis: Null hypothesis is the statement about parameter of population. Alternative…

Q: Explain what would happen to the length of the interval if the confidence level were decreased to…

A: Here Given  Sample size=n=60 Sample mean=x¯=12.88 And From Normal table Critical values for  95 C.I…

Q: In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta…

A: Variable:             A Variable is an attribute that describes the data like date, status, person,…

Q: A random sample of 174 college students was asked to indicate the number of hours per week that they…

A: Given test is appropriate for z-test for single mean because the sample size is large (n>30).

Q: A quality control expert at a pretzel factory took a random sample of 10 bags from a production run…

A: Given information: A random sample of n = 10 bags is taken. Sample data results in a sample mean of…

Q: In a study of academic procrastination, researchers reported that for a random sample of 41…

A: The provided information are:

Q: A researcher would like to estimate the mean weight of all adult female American alligators in the…

A: We have given that. Sample size (n) = 146 Sample mean (x̅) = 217 Standard deviations (σ) = 16…

Q: A recent survey of 50 executives who lost their job showed that it took 26 weeks for them to fin…

A: Given information: n=50 x-bar=26 s=6.2 Given confidence level is 95%. Significance level is…

Q: A survey conducted by the American Automobile Association showed that a family of four spends an…

A: Here Given  Sample size=n= 64 sample mean=$ 256.45=x¯ Sample standard deviation = $ 72.5=s

Q: determine the margin of error, E, and a confidence interval for the average household income in…

A: here given , An economist would like to estimate the average household income in Indian River…

Q: A research company took a sample of 80 textbooks and collected information on their prices.  The…

A: The random variable price of text books follows normal distribution. We have to test construct the…

Q: A personnel manager has found that, historically, the scores on aptitude tests given to applicants…

A: Solution-: Given:  σ=25.86,n=13,x¯=70.92,CI=(57.8665,83.5735) We want to find the confidence level…