Assuming normality, contruct and interpret a 90% confidence interval for the average monthly earning from Toyota Vehicles

Q: a) Calculate the sample mean, x. b) Calculate the sample standard deviation c) Using the p value…

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Q: Given that X̄=20, σ=9 and n=81, construct the following confidence intervals: the 90% confidence…

A: Given  X̄=20 σ=9 n=81 Z- test is used because n is greater than 30 and the population standard…

Q: Find the confidence interval for estimating the population proportion for parts (a) through (c). a.…

A: Formula for calculating confidence interval is  Confidence Interval=p∧±z*p∧(1-p∧)n

Q: If n=200 and X=60, construct a 90% confidence interval estimate for the population proportion (Round…

A: The likelihood that a parameter will fall between two values around the mean is shown by a…

Q: A researcher is interested in estimating the mean blood alcohol content (BAC) of people arrested for…

A: we have formula for margin of error = Z@/2 * standard deviation/sq(n) we have n=250, Z@/2 = 1.645

Q: We can make a confidence interval more precise (narrower) by, a increasing the sample size.       b…

A: The probability that a population parameter will fall between a set of values for a particular…

Q: A sample size of 200 light bulbs was tested and found that 11 were defective. What is the 95%…

A: Answer in step 2 Note please post second question seperately. Thankyou

Q: Two samples are taken with the following numbers of successes and sample sizes ri = 39 r2 = 34 n1 =…

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Q: If confidence level is 92% Find level of signifcance alpha

A: Given: Confidence level = 92% = 0.92

Q: A survey conducted by the American automobile association show that a family of four spent an…

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Q: A car-rental company is interested in the amount of time its vehicles are out of operation for…

A: * ANSWER :-    From the given information the answer is provided as below

Q: Which of the following factors affecting decision on sample size p. The confidence level ( the…

A: Population size: Population size can be defined as the total number of people in a particular type…

Q: nnual starting salaries for college graduates with degrees in business administration ntunen $30.000…

A: Annual starting salaries for college graduates with degrees in business administration are generally…

Q: The confidence intervals (CI) (also know as interval estimates) gives a likely" range of values for…

A: Given  Confidence interval for β1 = [-4.9, 10.3] H0: β1=0

Q: It is well known that car buyers often add accessories to their new cars. A sample of 179 Ottawa…

A: According to the question, below information given that : n = 179 x = 5000 σ = 1500   z score for…

Q: According to the normal distribution, __________% of the data would fit within 1 standard deviations…

A: Normal distribution is the situation where the random variable fit in to the symmetric bell shaped…

Q: A simple random sample of 37 rolling-and-wheeled backpacks being sold on Amazon had a mean price of…

A: As given sample size = 37 Mean price = $67.49 Population standard deviation = 14.33 Value of 90%…

Q: The body temperatures in degrees Fahrenheit of a sample of adults in one small town are: 97.8 97…

A: Given: 97.8 97 97.5 99.1 98.4 97.9 97.7 The formula to compute the confidence interval if we…

Q: A survey is proposed to be conducted to know the annual earnings of the old Statistics graduates of…

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Q: You may need to use the appropriate appendix table or technology to answer this question. A simple…

A: Given: Sample size (n) = 40 Population standard deviation (σ) = 8

Q: An estimator that is correct (i.e., it is equal to the true population parameter ) more than half of…

A: In economics, an estimator refers to a specfiic variable used by the researcher to get an estimation…

Q: Godrej soap manufacturing company was distributing a particular brand of soap through a large number…

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Q: Analysis showed that the mean arrival rate for vehicles at a certain Shell station on Friday…

A: As per the given information, lambda = 4.5…

Q: Suppose the sample mean from a random sample of n observations drawn from a population known to have…

A: Given the sample mean X(bar) and standard deviation.

Q: A stenographer claims that she can take dictation at the rate of 120 words per minute. Can we reject…

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Q: Find the 95% z-interval or t-interval for the indicated parameter. (a) µ x= 152, s= 31, n= 35 (b) p…

A: Since you have posted multiple question ( part a and part b are different t each other) So as per…

Q: An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city…

A: Per capita income or total income measures the average income earned per person in a given area in a…

Q: Tom wants to estimate the percentage of students who live more than 3 miles from the school.He wants…

A: Confidence interval for population proportion at 95% level                   P∧ ± Z0.95p∧q∧n…

Q: 16 The margin of error for a 95% confidence interval for β₁ is, a 1.0045           b 1.0574…

A: Regression Result:  reg y x       Source |       SS           df       MS      Number of obs   =…

Q: You may need to use the appropriate appendix table or technology to answer this question. A survey…

A: *SOLUTION :-

Q: 1. If X=87, o=9, and n=69, construct a 99% confidence interval estimate of the population mean, μ.…

A: For know variance we used the normal distribution and for unknown variance we uses the t…

Q: The owner of a large car dealership believes that the financia crisis decreased the number of…

A: Population parameter refers to a number that describe something about an entire group or population.…

Q: The police department of a U.S. city reported that the mean number (μ) of auto thefts per…

A: Using the Z formula to find the solution

Q: A sports shop selects a random sample and records the sales of items made in China and those made in…

A: SE (standard error)- It is the approx standard deviation of a sample population of statistics.

Q: A chemist measures the haptoglobin concentrations (in grams per liter) in the blood of eight healthy…

A: Given that n = 8 < 40 we have to use student's t distribution.

Q: A problem of the linear probability model is that an OLS estimation of it can generate fitted values…

A: When talking about regression models, different form of models give different information and they…

Q: A company that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola…

A: Ho is nothing but the null hypothesis where Ha is alternate hypothesis.

Q: The 95% confidence interval for B, is the interval: OA. (-1.96SE(,). Â + 1.96SE (#,)). O B. (…

A: The 95% confidence interval defines a range of values that you can be 95% certain contains the true…

Q: What can I do (Application) Determine what is asked based on the given data below. 1. A study was…

A: The provided information are: Sample size(n)=81Sample meanx¯=24000Sample standard deviation(s)=1000

Q: A large hospital wholesaler, as part of an assessment of workplace safety, gave a random sample of…

A:

Q: Suppose that a random sample of 192 twenty-year-old men is selected from a population and that their…

A: Given, Weight = -95.4336 + 3.7824 × Height  Std error of height = 0.2976 Now, Confidence interval…

Q: Q.4. A random sample was selected from a population having a normal distribution. Calculate a 90%…

A: Confidence Interval for Population Mean is given by the formula : CI(μ)=x¯±tn-1,1-α2·sn   a. Using…

Q: If the level of confidence is lowered from 95% to 90 % , but the allowable error  and the standard…

A: We know that of all the possible statistics that comprise a sampling distribution, 95% of them are…

Q: All patients admitted to a particular hospital can be released on the same day or kept overnight for…

A: Econometrics refers to the branch of economics that deals with statistical aspect of society.

Q: Which of the following would NOT produce a confidence interval with a smaller margin of error?…

A: The term 'margin of error' is used to explain the possible range of the error in a specific analysis…

Q: 1. A survey on student behavior in some major College in Oman asked a randomly selected group of 300…

A: a) Given mean μ = 4.5 Standard deviation σ = 2.9 For 95% confidence, z= 1.96 Sample size n = 300…

Q: Of 900 people treated with a new drug, 180 show allergic reaction. Construct a 98% confidence…

A: We have p^ = 180/900 = 0.2

Q: The Stevens Motor Company is developing high powered engines for use in its new sports coupe. The…

A: Confidence Limits or Interval: Confidence limits are a statistical measure that tells us how…

Q: The higher the confidence level is, the more precise the confidence interval is * True O False

A: Confidence interval = Sample mean ± [Z-value for Confidence level x {Sample standard deviation /…