Question 7 x~N(9,64) Calculate the 95% confidence interval for this distribution.

Q: In order to construct a confidence interval on the difference between means, you need to assume that…

A: Solution: Assumptions for constructing a confidence interval on the difference between means are…

Q: use this to find a 95% confidence interval for the mean height of all red maple trees

A: The sample size is n = 146 Sample mean = 59 And sample SD = 12 Since the sample size is large then…

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Given : Margin of error = 5 α = 0.05 Population standard deviation = σ = 30 zα2 = z0.052 = 1.96

Q: A sample of 25 two-year-old chickens shows that they lay an average of 21 eggs per month. The…

A: Given, Sample size, n=25 mean, x =21 standard deviation, s=2   Formula for confidence interval( CI )…

Q: The president of a large university wishes to estimate the average age of the students presently…

A: Here we need to estimate a 95% confidence interval for the average age of students presently…

Q: GPA of SMSU students is normally distributed with standard deviation (sigma) = 0.8. The average GPA…

A:

Q: Find the lower boundary of the 90% confidence interval for the variance of the ages of seniors at…

A: Given that  Sample size (n)=24 Standard deviation sample (s)=2.88 years Let X varaible is normally…

Q: A student read that a 95% confidence interval for the mean age an American first drinks alcohol is…

A: Lower limit = 16 - 1.2 =14.8 Lower limit = 16 + 1.2 =17.2

Q: The age when smokers first start from previous studies is normally distributed with a mean of 13…

A: Given,sample size(n)=22sample mean(x¯)=13.8standard deviation(σ)=2.1α=1-0.90=0.1α2=0.05Z0.05=1.645…

Q: Suppose scores on exams in Biology are normally distributed with an unknown population mean and a…

A: given data σ = 5.4n = 60 x¯ = 81find 90% ci for μ = ?

Q: A sample of 22 adults attending a country fair determined that the mean age was 35 given that the…

A: Answer: From the given data, Sample size(n) = 22 mean (x¯) = 35 Standard deviation(σ) = 10 95%…

Q: what is the 90% confidence interval of the standard deviation where n= 20 and s=40.5

A:

Q: A random sample of 5 months in an urban area showed an average of 28 mail carriers were bitten by…

A: Here we need to construct a 95% confidence interval for the mean number of mail carriers who were…

Q: Find a 99% confidence interval for the population mean age of the Smurfs, if a sample of 50 smurfs…

A:

Q: ample mean of 62.2 was found and a 95% confidence interval of (57.3, 67.1) was also found. What is…

A: The sample mean for the  population is 62.2  . Confidence interval is (57.3 , 67.1)

Q: The ability to find a job after graduation is very important to GSU students as it is students at…

A: Sample size n=3878Favorable cases x=3241

Q: The operations manager at a light emitting diode (LED) light bulb factory needs to estimate the mean…

A: From the provided information, Sample size (n) = 64 Sample mean (x̅) = 49875 hours Population…

Q: A forestry researcher is conducting a study of trees in the upper midwest. He selects a random…

A: From the given information, n=125x¯=25s=5.2 Confidence level is 95%. Significance level is…

Q: A random sample of 40 students has mean annual earnings of $3120 and a standard deviation of…

A:

Q: The newest model of a car battery from a popular brand is supposed to have a lifetime of  60…

A: Key references: Rüther, T., Schamel, M., Plank, C., Schomburg, F., Röder, F., & Danzer, M. A.…

Q: 2. What is the 90% confidence interval for the variance of exam scores for 28 algebra students, if…

A: We have to find out given correct answer.....

Q: A random sample of 40 college students has a mean earnings of $3120 with a standard deviation of…

A: The objective of the question is to determine whether a normal distribution or a t-distribution…