21. How large of a sample is needed to estimate the population mean for the money a person spends on Christmas presents within $2 and be 95% confident? The standard deviation of the population is $7.50. О А. 54 О В. 54 С. 55 D. 56

Q: A certain type of thread is manufactured with a mean tensile strength of 78.3 kg and a standard…

A:

Q: Find the standard deviation of the following data:

A: The frequency and size of items are given belowSize of items10111213141516Frequency2711151041`Need…

Q: O D. One sample z-Test for proportions

A: In order to test the legitimacy of the manufacturer's claim,it is clear mentioned that to use the…

Q: I need the correct answers gor g1 = -2.00% and g2 = +2.00%

A: g1= -2%g2= +2%PVI Elevation = 750 ft and station = 30+00Fixed elevation, y = 753 ft and station…

Q: Consider the function, z = ɑ¡x¡ + a2x2. If the variances of x1 and x2 are 0.05 and 0.03,…

A:

Q: Exercise 5.3 An electronic scale at an automated filling operation stops the manufacturing line…

A: Bu using the negative binomial distribution: Given: (a) The probability of success p is 0.01. The…

Q: 30. A recent study of the lifetimes of cell phones found the average is 24.3 months. The standard…

A: Given:-  A recent study of the lifetimes of cell phones found the average is 24.3 months. The…

Q: the mean time of a project is 10 days with a standard deviation of 2, what is the expected time of…

A:

Q: expected time o

A: Probability distribution

Q: Q1/ (A) If the rainfall probability over Baghdad city is 20% during November (30 days), determine…

A: The probability of occurrence of rainfall within 30 days is 20%.

Q: A bar of length 'L' tapers uniformly from diameter 2.45 D at one end to 0.55D at the other end. If a…

A: Given data, Length of both bar = L Diameter of tapered bar D1 = 2.45 D Diameter of tapered bar D2 =…

Q: 1. Consider the data below in the range 0.4< x < 1.2. Calculate P3(0.9) using last four point

A: Note-Since we answer one question at a time so we will answer the first one.     Please resubmit…

Q: An electronic scale at an automated filling operation stops the manufacturing line after three…

A: Let x denotes the number of packages detected until the third weight packages is detected. Given -…

Q: 3.4 The load on a cantilever beam of length L consists of a load Pat the tip (free end) and a…

A: The length of the beam is a=6 ft. μp=4000 lb                    μw=50 lb/ft VP=10%…

Q: For computing the variance this number is called as the value that is added or subtracted from the…

A:

Q: In an experiment, if persons are tested for before-and-after measurements, then the samples are…

A: We take pre and post samples before and after testing in an experiment to compare the affects or…

Q: For a construction project. The standard deviation of project is 6.1 days. Assume normal…

A: Given data: For 95% confidence level, z = 1.64 TE=200 days σ=6.1 days

Q: Samples of sizen=5 are taken from a manufacturing process every hour. A particular quality…

A: The given data is as follows:

Q: You are tasked to measure a 2.1 m door with using only a ruler. On your first try you recorded a…

A: In recent measurement,  Measured value = 217 cm And,  true value = 2.1 m = 210 cm

Q: A population has a mean of u=30 and a standard deviation of sd=5. a. If 5 points were added to every…

A: u = 30 ;    Let Nn= 30 when 5 is added to each score.   N+5nn =Nn +5 =30 +5 =35 Therefore new mean…

Q: What is the approximate standard deviation of the population from which the samples were taken? O 19…

A:

Q: The distribution of the amount of gravel (in tons) sold by a particular construction supply company…

A:

Q: standard deviation of the completion For a construction project, the mean and time are 200 days and…

A:

Q: Assuming a standard normal distribution ( Table 19.11 ), what percentage of the data falls between…

A: To find:- what percentage of the data falls between −1.5 s to 1.5 s?

Q: . What is the value of M1 and M2? 2. What is the  percent error if the true value is 149 g?

A: In both  the beams , M1L1=M2  L2                               [balanced torque] In beam 1…

Q: A sample of 100 adult women was taken, and each was asked how many children she had. The results…

A: Given, A sample of 100 adult women was taken, and each was asked how many children she had.…

Q: 4. Which of the following is a characteristic of a confidence interval? A. It is constructed using…

A: The confidence interval represents the certainty of any method of statistics. Like we do not have…

Q: Example 1: A researcher wishes to estimate the number of days it takes an automobile dealer to sell…

A:

Q: Using the data below, compute for the most probable value, individual residual, probable error of…

A: To find : most probable value individual residual probable error of any single measurement relative…

Beams

In structural engineering, a beam is a component made of a variety of materials (including steel alloys, and wood) that can resist loads applied laterally to the beam axis. Members, elements, rafters, shafts, and purlins are all terms used to describe beams.