A confidence interval is desired for the true average stray-load loss for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. Assume that the stray-load loss is normally distributed with a standard deviation of 3.0. Compute a 95% confidence interval when n=25 and the sample mean is 58.3. What is the upper value of this confidence interval?   Compute a 95% confidence interval when n=100 and the sample mean is 58.3. What is the upper value of this confidence interval?   Compute a 99% confidence interval when n=100 and the sample mean is 58.3. What is the lower value of this confidence interval?

Q: The historical Average rainfall for Albany N,Y is 36.9 inches a year, with standard deviation of 4.3…

A: To test:H0:μ=36.9H1:μ>36.9

Q: From generation to generation, the mean age when smokers first start to smoke varies. However, the…

A: Solution

Q: A sample of size = 86 is drawn from a normal population whose standard deviation is o= 5.2. The…

A:

Q: A sample of size n=100 is drawn from a normal population whose standard deviation is a-5.8. The…

A: Given,n=100x¯=37.02σ=5.8α=1-0.95=0.051-α2=0.975Z0.975=1.96

Q: Find the critical values, χ L 2 and  χ R 2, used for a 95% confidence interval for the standard…

A: Given: Degree of freedom = 25 α = 1 - 0.95 = 0.05

Q: Find a 95% confidence interval for the difference

A:

Q: Suppose the number of defects in a sweater from a population of sweaters produced from a textile…

A: Solution: From the given information, the confidence level is 0.95.

Q: The confidence intervals discussed thus far give both a lower confidence bound and an upper confi-…

A: X-μσn has normal distribution z

Q: Suppose that the pulse rates of adult males vary from a low of 30 bpm to a high of 110 bpm.  Assume…

A: pulse rates of adult males vary from Low =30 bpm High=110 bpm confidence level=95% Margin of…

Q: A random sample of 52 measurements was selected from a population with σ=3.6. The sample mean was…

A:

Q: A random sample of 10 night students was taken with a sample mean GPA of 3.5 and a standard…

A: given data, x¯1=3.50s1=0.07n1=10x¯2=3.48s2=0.04n1=15population with unequal variances.

Q: In a survey of adults with diabetes, the average body mass index (BMI) in a sample of 1924 women was…

A:

Q: A random sample of 25 night students was taken with a sample mean GPA of 2.86 and a standard…

A: We have given with usual notation as follows: For night students: n1=25 x¯1=2.86 s1=0.06 For day…

Q: In simple linear regression, at what value of the independent variable, X, will the 95% confidence…

A: Let Y be the dependent  variable and X be the independent variable then the simple linear regression…

Q: random sample of 68 SAT scores of students applying for merit scholarships showed an average of 1400…

A:

Q: The waiting times​ (in minutes) of a random sample of 2020 people at a bank have a sample standard…

A: The objective of this question is to construct a 90% confidence interval for the population variance…

Q: A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least…

A: Given: Sample size (n) = 21 Sample mean life of a light bulb x¯=723 Population standard deviation…

Q: We take a random sample of 25 scores from a biology exam and the sample mean is 80 ( the population…

A: From the given information, there are 25 scores, the population standard deviation of 12 and the…

Q: A study of the growth of a certain kind of orchid showed that (under controlled conditions) a random…

A:

Q: We want to estimate a population mean u of a population with a standard deviation s=12. What size…

A: We have given that,  Population standard deviation (σ) = 12, confidence interval (c.i) = 95% = 0.95…

Q: Leaf surface area is an important variable in plant gas-exchange rates. Dry matter per unit surface…

A: Solution: To find: Which of the following four statements best describes the relationship between…

Q: A researcher collected sample data for 11 middle-aged women. The sample had a mean serum cholesterol…

A: Given datan=11mean=190.4standard deviation=6.6confidence interval=95%

Q: Find the critical value zc that corresponds to a confidence interval with 0.07 .  Round to the…

A: A critical value defines the rejection region where the test-statistic value lies indicates the…

Q: a sample of n=16 scores has mean of M=58 with SS=540. Use the sample to construct the 95% confidence…

A: Solution: From the given information, n=16, M=58 and SS=540.

Q: lete solution

A:

Q: What is tα/2,df for a 95% confidence interval of the population mean based on a sample of 15…

A: Solution: We have to find the t-critical value (tα/2) at the given significance level 1- 0.95=0.05…

Q: The waiting times​ (in minutes) of a random sample of 2020 people at a bank have a sample standard…

A: The objective of this question is to construct a confidence interval for the population variance and…

Q: Records of the past 15 years have shown the average revenue of company A for the month of March to…

A: Introduction: Denote μ1, μ2 as the true average revenues (M pesos) of Companies A and B,…

Q: An electrical firm manufactures light bulbs that have a length life with normal distribution, and a…

A:

Q: Find a 90% confidence interval for the population mean age of the Smurfs if a sample of 52 smurfs…

A: It is given that, There is a random sample of size 52 and has a mean of 49.7 and the standard…

Q: A sample of 20 fossil skeletons of an extinct species of bird has been collected. The mean length of…

A: Step 1:To find the 90% confidence interval for the population mean length of the skulls of this…

Q: An SRS of 350 high school seniors gained an average of x¯=24 points in their second attempt at the…

A: (a). From this given information, the value of mean is 24, standard deviation 48 and sample size (n)…

Q: A researcher wishes to estimate the mean response of a variable for a population of individuals, µ.…

A: We have given that,  Population standard deviation (σ) = 17.25 and Margin of error (E) ≤ 5  and…

Q: A random sample of 35 observations is taken from a population with unknown mean u and known standard…

A:

Q: The high price of medicines is a source of major expense for those seniors in the United States who…

A:

Q: If you were constructing a 99% confidence interval of the population mean based on a sample of n =…

A:

Q: 2. We have a random sample of size 17 from the normal distribution N(µ,o²) where µ and o? are…

A:

Q: Find the error margin for a 98% confidence interval for the average value of Y when X is 9.

A: Given: The error margin for 98% confidence internal for the average value of Y when X is 9

Q: Modern laser equipment has been used to measure the distance between two points. Each measurement…

A:

Q: was 10 days. The 44 seeds that were exposed to classical music took an average of 30 days to…

A: Given Data : For Sample 1 x̄1 = 26.0 s1 = 10.0 n1 = 50 For Sample 2…

Q: The pulse rates of 215 randomly selected adult males vary from a low of 33 bpm to a high of 121 bpm.…

A: Solution: From the given formation, smallest pulse rate is 33 bpm, the largest pulse rate is 121 bpm…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.