How large a sample is needed to be 90% confident that the sample mean interest rate for a 30 year fixed mortgage is within .02% of the true mean

Q: the claim that the mean breaking strength has increased

A: Given : n=18 , X-bar=1919  , σ=70 , μ0=1875 , α=0.01 We want to test the claim that an improvement…

Q: how many students must be randomly selected to estimate the mean weekly earnings of students at one…

A: Here we need to find the required sample size with 95% confidence. Given SD=54, Margin of error=5.

Q: Calculate the mean deviation (from mean) of the following series: Marks 15 25 35 45 No. of students…

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Q: If you make α too small (e.g., α = 0.0000000001), what kind of error are you more likely to make?…

A: Assuming, Initially  α = 0.05

Q: 0 How many students must be randomly selected to estimate the mean weekly earnings of students at…

A:

Q: The quarterly returns for a group of 68 mutual funds with a mean of ​2.8% and a standard deviation…

A: Given data: Mean =  ​2.8% and standard deviation = 6.8% can be modeled by a Normal model. Based on…

Q: The population standard deviation for the heights of dogs, in inches, in a city is 6.7 inches. If we…

A:

Q: Assume that ther is a true difference in mean population growth by the categories of towns (based on…

A: Assume that there is a true difference in mean population growth by the categories of towns (based…

Q: Assuming that the process is in contorol, estimate the standard deviation for the following…

A: Sample size n = 8 and number of sample is k = 64

Q: The data are shown in the table below. At a = 0.05, can it be concluded that there is a significant…

A: Given: n = 18 k = 3

Q: People who live near a former rocket-tes are concerned that perchlorate is preser unsafe amounts in…

A: mean = 24.5 n = 28 sample mean = 25.3

Q: Suppose that X has an exponential distribution with a mean of 35. What is P(X<7) ?

A: Given that, The provided mean is β = 35

Q: with 99% confidence, the potential future investment return will fall in approximately ____ standard…

A: When measured in standard deviation units, a z-score defines the location of a raw score in terms of…

Q: Which of the following is(are) TRUE? * I. Based on the sample of 654 young adults, a point estimate…

A: From the output, 95% confidence interval is, (13.572, 15.872) Interpretation: There is a 95% chance…

Q: The mean is 20,000 and the standard deviation is 1000, use the 68-95-99.7 rule to find the…

A: We have given that the mean is 20,000 and the standard deviation is 1000.

Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

A: Given Data Population Mean,μ = 110 Population Standard Deviation,σ = 20

Q: A researcher who she’s to estimate within $2 the average repair cost for a refrigerator.  if she…

A: From the provided information, Population standard deviation (σ) = $15.25 Confidence level = 95%…

Q: If you want to be 95% confident of estimating the population mean to within a sampling error of ±5…

A: formula for the sample size :

Q: Assuming the mean length is 3.00 . Find the probability that the next measured part will have a…

A: It is given that the mean is 3.00 and standard deviation is 0.105.

Q: This figure presents the percentage deviation from the 60:40 ratio in the market values of equity of…

A: Given that,

Q: READ AND SOLVE THE FOLLOWING: Interval Estimate of Population Mean 1. Suppose that the amount of…

A: We. Have to find confidence interval for given data..

Q: find the standard deviation, for the binomial distrubution which has n=48 and p=3/5. Round answer to…

A:

Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

A: Given,mean(μ)=100standard deviation(σ)=15

Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

A: Obtain the standard z-score for the random variable X equals 124. The standard z-score for the…

Q: Suppose the graduation rate from the last 5 years at wayne state university hasw standard deviaton…

A: Standard deviation:Standard deviation helps to identify the spread of data for a group from the…

Q: A researcher wishes to determine how much money per week is spent on groceries in a small Western…

A: Given : ME&lt; 3.0 σ= 18.0 At 98.0 % confidence level , z score= 2.326 Need to find the minimum…

Q: For the hawkins company, the monthly percentages of all shipments received on timeover the past 12…

A: a) The given information is that the monthly percentages of Hawkins company’s entire shipments of…

Q: An 1868 paper by German physician Carl Wunderlich reported, based on over a million body temperature…

A: A). It is given that an adult body temperature is approximately normally distributed with mean 98.6…

Q: A normal population has the mean m=70 and standard deviation 20. what proportion of the population…

A: Obtain the proportion of the population is greater that 95. The proportion of the population is…

Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

A: The pdf of normal distribution of a random variable X with mean μ and standard deviation σ is given…

Q: 2) based on earlier studies it is known that the standard deviation is 12.3 days per year. How large…

A:

Q: The population standard deviation for the heights of dogs, in inches, in a city is 5.7 inches. If we…

A:

Q: From a sample with n=32, the mean number of televisions per household is 2 with a standard deviation…

A: Given n=32 Mean =2 Standard deviation=1

Q: Suppose the rate of return for a particular stock during the past two years was 10% and - 45%.…

A:

Q: When computing a 95% CI for a population mean, the ____ is used as the point estimate.

A: Given that  When computing a 95% CI for a population mean, the ____ is used as the point estimate.…

Q: Solve and sketch the problem.  Suppose that the amount of time it takes the Bureau of Internal…

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Q: 25. A survey found that people ke deviation is 0.56 year. If a pers

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Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

A: Given : μ=100σ=15X~N(μ=100,σ2=(15)2)We want to find,P(X&gt;128)=?

Q: a- using the expected value method, b- using the standard deviation c-using Coefficient of variation…

A: a) Alternative A E[X]=0.2*30,000+0.5*25,000+0.3*20,000 =24,500 Alternative B…

Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

A: From the provided information, Mean (µ) = 100 minutes Standard deviation (σ) = 10 minutes Let X be a…

Q: The following data show the interest rates on 4 randomly chosen personal loans (in percents): 6.6,…

A:

Q: Suppose you are told that the average return on investment for a particular class of investments was…

A:

Q: How many Biology students’ records need to be sampled to estimate the percentage who earn "A"s to…

A: The proportion is not provided therefore in worst case it can be assume as (p) 0.5. Margin of error…

Q: How large a sample must be taken to be 99% confident that the estimate of the average time of…

A:

Q: years. How many sample batteries must be taken to estimate the true mean length to within 0.02 years…

A: here given, MOE   =  0.02 z-critical for 99 % confidence level = 2.576 (use excel command…

Q: In a group presentation, the average geometric reasoning of Grade 10 students in a Mathematics camp…

A: It is given that the mean is μ=80 and the standard deviation is σ=4 Hence the p value is given by:…

Q: If the true mean is 0.9480 with a standard deviation of 0.0060, within what interval will 95% of the…

A: Random samples of 35 blended fuels are tested in a lab to ascertain the bio/total carbon ratio. The…

Q: If a sample of n = 25 scores is selected from a normal population with µ = 100 and σ = 20, then the…

A:

Q: Read each situation and perform the appropriate test of hypothesis for the one sample mean z-test…

A: Given: μ=6σ=1.75n=35x¯=5α=0.01

Q: How large a sample must be taken to be 99% confident that the estimate of the average time of…

A:

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.