Q2. A laundry for car wash found that the average, for small size car, cleaning time is 5 mins in the morning and 6.5 mins at evening time when a sample of size 30 is taken at the two time periods. From the previous record, the laundry manager knew that car o1 = 2 mins for the morning shift and o = 2.5 mins for morning and evening repectively. Find the interval estimate for -2 with 90% confidence level.

Q: A sample of n = 15 scores has a mean of M = 6. One person with a score of X = 72 is added to the…

A:

Q: A study found the lengths of daily driving time for people in your district are Normally distributed…

A: The mean is 35 minutes and the standard deviation is 3.

Q: A sample of n=5 scores has a mean of x=9. what is Ex for this sample?

A: Mean = 9 n = 5

Q: A sample of n = 6 scores has a mean of M = 10. One score in sample is changed from X = 12 to X = 0.…

A: Given that, n = 6  mean of M = 10

Q: The highway department is testing two types of reflecting paint for concrete bridge end pillars. The…

A: Sample 1 (orange paint): n1=12x¯1=9.4s1=2.4 Sample 2 (yellow paint): n2=12x¯2=7.1s2=2.0

Q: The highway department is testing two types of reflecting paint for concrete bridge end pillars. The…

A: There are two independent samples which are orange paint and yellow paint. We have to test whether…

Q: The highway department is testing two types of reflecting paint for concrete bridge end pillars. The…

A: Obtain the value of the test statistic. The value of the test statistic is obtained below: The…

Q: Q2. There is a claim that the average height of the students in a university is 155cm. A researcher…

A:

Q: A simple random sample of 100 observations was taken from a large population. The sample mean and…

A: Given that ,                    sample size n=100                    Mean u=80…

Q: he highway department is testing two types of reflecting paint for concrete bridge end pillars. The…

A:

Q: Suppose the data represent the inches of rainfall in April for a certain city over the course of 20…

A: From the provided information,n = 20

Q: A sample of n=5 scores has a mean of M = 12. if one new score with a value of x =17 is added to the…

A: Given information n=5 Mean M=12 Formula of mean is given by M=∑xin Where, xi are data points and n…

Q: random sample of about 1000 people to estimate the mean of some quantity over a population of…

A: A confidence interval estimate is an interval estimate that includes the unknown population…

Q: Suppose the rate of misprints in the printed text from a given publisher is three misprints per one…

A: The question is about discrete probability distribution.Introduction :1 ) Let, X be discrete random…

Q: Nabisco claims that Chip Ahoy Cookies have an x ̅=28.67 chocolate chips per cookie with a SD=2.67.…

A: The formula for calculating standard error is  SE = σ/√n

Q: As the director of a research laboratory you are paid to decide if there is a significant difference…

A: Denote μ1, μ2 as the population mean values of data for Senior scientist and new kid, respectively.

Q: One sample of n = 4 scores has a mean of M = 12, and a second smaple with n = 6 scores has a mean of…

A:

Q: The highway department is testing two types of reflecting paint for concrete bridge end pillars. The…

A: Given: Significance level α = 1% = 0.01 For Orange Paint: n1 = 12 X1 = 9.4 s1 = 2.4 For Yellow…

Q: If random samples of the given sizes are drawn from populations with the given proportions, find the…

A:

Q: ple of n = 15 scores has a mean of M = 6.  One person with a score of X = 22 is added to the sample.…

A: The mean formula is, Mean = Sum of all observations/ Total observations, Given: Mean (M) = 6 Total…

Q: One sample of n = 10 scores has a mean of M = 8, and a second sample of n = 5 scores had a mean of M…

A:

Q: Suppose X~N(19, 2.5).  Find the 50th percentile.

A: Introduction: The random variable X has a normal distribution, with parameters- mean, μ = 19, and…

Q: A sample of n = 4 scores has a mean of M = 8. If one new score with a value of X = 3 is added to the…

A: Given,No. of observations (n) = 4and mean (M) - 8we know that,Mean (M) = ∑Xii=1nn

Q: A sumple from a normal population with mu = 50 and sigma = 6 of M=48.20, . the sample…

A: Given Information: Population mean μ=50 Population standard deviation σ=6 Sample mean (M) = 48.20…

Q: The competitors in asbeauty contest are ranked by three Judges in the following order 1st Jud e 7 '6…

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Q: A statistics teacher taught a large introductory statistics class, with 500 students having enrolled…

A: The given claim is that the smaller class was more effective and the students perfume better than…

Q: A standardized exam’s score are normally distributed. In a recent year, the mean test score was 1477…

A: Introduction: Consider X as a normally distributed random variable, with mean μ and standard…

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

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Q: S = 2722 - 16,900/7 7-1

A: The given equation is:

Q: The mean weekly wages of workers are with S.D. of rupees 4. A sample of 625 is selected, find the…

A:

Q: A sample of n = 5 scores has a mean of M = 8. if one new score with a value of X = 2 is added to the…

A: