Mr. X. wants to determine on the basis of sample study the mean time required to complete a certain job so that he may be 95% confident that the mean may remain within + 2 days of the true mean. As per the available record the population variance is 64 days. How large should the sample be for his study?

Q: (c) Find the probability that a student participates in at least two activities. The probability tha...

A:

Q: Sample distribution of variance follows a Chi-Square distribution with n-1 degrees of freedom   tr...

A: We have given that,  Sample distribution of variance follows a Chi-Square distribution with n -1 deg...

Q: For the sample data 7, 9, 10, 11, 13, 22find the standard deviation (give your answer in three decim...

A: Given data is7,9,10,11,13,22sample size(n)=3

Q: Complete the table: STEPS SOLUTION | 1. Draw a normal curve. 2. Locate the z-value | 3. Draw a line ...

A: The normal curve is a bell shaped curve which is symmetric about the mean. Almost 99.7% of the area ...

Q: An engine health monitoring system consists of a primary unit and a standby unit. The MTTF of the pr...

A:

Q: Find the mean of the variables X and Y and correlation coefficient, given the following: Regression ...

A: Solution is given:

Q: 1. What proportion of babies were born in 30 weeks or less? 2. What is the fewest number of weeks a ...

A: Given information:- Number of values per dot = 3

Q: 2 Margin of Error: E = We are 98% confident that college students get an average of between hours an...

A:

Q: According to San Jose Mercury News, children in China average 3 hours a day unsupervised. Most of th...

A:

Q: Match the correct critical values for the t, and chi-square and tolerance interval factor v X2 0.025...

A: (i) Chi-sqare at 0.025 and 7 degrees of freedom is     X2= 16.013 Option (B)  (ii). Chi-sqare at 8-1...

Q: Example 4.9 SuppOse that X1,..., X, form a random sample from a Poisson distri- bution with unknown ...

A:

Q: high school principal wanted to know how the teachers at her school felt about early dismissal for H...

A:

Q: Part 3 of 4 The area to the right of z=2.26 is. Part 4 of 4 The area to the right ofz=0.86 is

A:

Q: Example 62. The following table gives the weight (in Kg) of 60 students. Find.the value of Mode grap...

A:

Q: A card is drawn from an ordinary pack and a gambler bets that it is a spade or an ace. What are the ...

A:

Q: You must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperature...

A:

Q: Car inspection: Of all the registered automobiles in a city, 11% fail the emissions test. Fourteen a...

A:

Q: The company that produces the cold medication is claiming that each bottle contains 355 milliliters ...

A: Given: sample size, n = 20 Population mean, μ = 355  

Q: A researcher is interested in finding a 90% confidence interval for the mean number minutes students...

A: For the given data Find a. To compute the confidence interval use a ___________   distribution. b. W...

Q: Example 5.4 Consider a random sample (X1. X2..X) from an exponential dis- tribution with parameter à...

A:

Q: If the sample size is large, the normal distribution could be used for the interval estimate of the ...

A: Here given,  sample size is large 

Q: .You are given the data relating to purchases and sales. Obtain the regression equation by the metho...

A: Given data, X Y X*Y X*X Y*Y 62 112 6944 3844 12544 72 124 8928 5184 15376 98 131 12838 9604...

Q: 1. The height of 30 students of Mathematics, Science & Computer Department was measured in cm. The r...

A: Given information: 163, 163, 164, 165, 166, 168, 169, 170, 170, 171, 171, 172, 173, 175, 175, 175, 1...

Q: Need an example of multiple linear regression

A: Multiple linear regression is where more than one independent value, meaning that we try to predict ...

Q: A local TV station conducted a "Pulse-Poll" about the upcoming mayoral election. Evening news viewer...

A: Explanation: here given the think of station faulty prediction more likely Here based on the above s...

Q: Confidence intervals on the variance is very sensitive on the normality of the data whie the confide...

A: Confidence interval of variance assumes normality of samples, and is very sensitive to the sample di...

Q: The CEO of Flying Fire Corporation claims that an average flying fire light bulb lasts 300 days, A r...

A: Given : CEO's claim that average flying fire light bulb lasts 300 days Sample size (n) =15 Standard ...

Q: If you manufacture jewelry and wished to make a specific design for a ring in only one size, what sh...

A:

Q: If Y is a continuous random variable such that E[(Y –a)²] <o for all a, show that E[(Y – a)²] is min...

A:

Q: When bonding teeth, orthodontists must maintain a dry field. A new bonding adhesive called "Smartbon...

A: Hypothesis testing : Hypothesis testing may be a style of applied mathematics reasoning that involve...

Q: 500 apples are taken at random from a large basket and 50 are found to be had Éstimate the propurtio...

A:

Q: Confidence intervals on the variance is very sensitive on the normality of the data while the confid...

A: Confidence interval of variance assumes normality of samples, and is very sensitive to the sample di...

Q: How large a sample size do we need to estimate the mean annual income of Michigan residents, correct...

A:

Q: Match the correct critical values for the t, and chi-square and tolerance interval factor

A: t at 0.05/2= 0.025 level of significance and n-1= 16-1= 15 d.f. from the table,   t= 2.13145  Option...

Q: Let Y1, Y2, Yn be a random sample from a Normal distribution with mean µ and variance o?. T · , (n-1...

A:

Q: i) Let X be a random variable with the PDF f(x: 0) =e-(1-", 00, S(x; A, jµ) = { ^†" -e/", x0 and u> ...

A:

Q: a. P(X < 0.25) b. P(0.25 < X < 0.75) c. Mean and variance

A: Suppose that x has a beta distribution with parameters α = 2.5 and β = 1.

Q: A pharmaceutical company conducted a study to test the effectiveness of its new anti-depression medi...

A: Given, Pharmaceutical company conducted a study for a new anti-depression medication. 500 adults suf...

Q: Bottle Number 1 2 3 4 5 6 7 8 9 10 Milliliters 347 356 340 350 347 354 351 340 342 358 Bottle Number...

A:

Q: Twenty years ago, Juan Medina and Bertha Zenith got married. The Medina-Zenith family's biggest life...

A: P(Having a boy) = 1/2, P(Having a girl) = 1/2 P(Having atleast one Girl) = 1 - P(Having no girl) P(H...

Q: 9. Samples of regular intervals. A normally distributed quality char- acteristic is measured and F a...

A:

Q: An automobile is being filled with petrol. The probability that also need to be changed is 0.25, the...

A: Given data,Let A be the event that oil need to be changedLet B be the event that new filter is neede...

Q: In a survey, 26 people were asked how much they spent on their child's last birthday gift. The resul...

A:

Q: An automobile is being filled with petrol. The probability that oil is also need to be changed is 0....

A: GivenThe probability that oil is also need to be changed is = 0.25The probability that new filter ne...

Q: (b) Is it an expected gain or an expected loss? Round the answer to two decimal places. This is an e...

A: Here  We will use Table for the Expected value

Q: It is known that the reliability function for a critical solid state power unit for use 10 ,t20 and ...

A:

Q: Given below is the monthly trend equation: Y = 130 + 1.8X [Origin : 1/7/2002/ X unit = one month and...

A:

Q: X ev An investigator has reported the data tabulated below. It is known that such data can be modele...

A: Solution:

Q: The height of a certain type of palm tree is normally distributed with mean 45 feet and standard dev...

A: The height is normally distributed with a mean 45 and a standard deviation of 10.

Q: If a seed is planted, it has a 60% chance of growing into a healthy plant. If 12 seeds are planted, ...

A: