A manufacturer of cell phone batteries wants to estimate the useful life of it's the battery (in thousand of hours.) The estimate is the be within 0.10 (100) hours. Assume a 95 percent level of confidence and that the standard deviation of the useful life of the battery is 0.90 (900 hours). Determine the required sample size.

Q: The nutrition label for Oriental Spice Sauce states that one package of sauce has 1080 milligrams of…

A: The objective of this question is to calculate a 90% confidence interval for the mean sodium content…

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: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Confidence interval is the range in which you expect the value of your estimate to lie. Confidence…

Q: In a sample of 30 people, the average cost of a latte is $3.55. The standard deviation for the…

A: As given sample of 30 people, i.e. n= 30 the average cost of a latte is $3.55. standard deviation =…

Q: Assuming normality, contruct and interpret a 90% confidence interval for the average monthly earning…

A: For Toyota cars mean sale of a sample of 27 cars x¯ =165 standard deviation of 27 cars (s) = 9.5 We…

Q: 4) Early study results show that 80% of customers are willing to pay an extra dollars on their…

A: The information given as follows:- Margin of error = 0.012 proportion = 0.8

Q: A sample of 27 elements from a normally distributed population is selected. The sample mean is 14…

A: According to the question, it is given that : Sample =  27 elements Sample mean = 14 Sample…

Q: Claim: The mean pulse rate (in beats per minute) of adult males is equal to 68.8 bpm. For a random…

A: Performing a hypothesis test is used to find evidence that supports a claim is a statistical…

Q: MRS = 1/2x1 , so x1 =  1.25 and x2 =  1.5 Confirm Thanks

A: The economic concept of utility maximization asserts that consumers aim to attain the greatest…

Q: According to R.L. Polk & Co., Americans held onto their new vehicles for an average of 71.4…

A: Standard error can be calculated using this formula:SE = n​σ​where:σ = population standard deviation…

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

A: Given: Confidence level = 92% = 0.92

Q: EARNINGS = bela0+ beta1 HEIGHT error where the unit of EARNINGS is dollars per year and the unit of…

A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…

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

A:

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: Grades on a standardized test are known to have a mean of 990 for students in the United States. The…

A: Identify the Sample Mean (xˉ):  This is the average score from the sample of Florida students, which…

Q: manufacturer fills soda bottles. Perlodically the company tests to see IT there is a difference…

A: A hypothesis test for two population of test statistic means is given by

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: average price of 350 cellphones is Php 20,000 with a sample standard deviation of Php 2500. Find the…

A: Standard deviation is a statistical measure that quantifies the amount of dispersion in a given set…

Q: sssss A consumer affairs investigator records the repair cost for 4 randomly selected TVs. A sample…

A: The objective of this question is to find the critical value that should be used in constructing the…

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: Suppose a random sample of size 41 is selected from a population with a = 11. Find the value of the…

A: If the sample is chosen with replacement, the standard error is determined by dividing the…

Q: Below is a table showing the ages of current active users of TikTok. Use the table to approximate…

A: The average degree of variability in your dataset is represented by the standard deviation. It…

Q: 10. 7 students were asked how many pencils they had. The responses were 2, 5, 8, 3, 1, 6, and 4. a.…

A: a. Mean = sum of all valuestotal number of values                           = ( 2 + 5 + 8 + 3 + 1 +…

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: Those without any health insurance in the U.S. tend to be the following groups, except:  A. Those…

A: Health insurance is a type of insurance that covers medical expenses that arise due to illness.…

Q: A population has a mean of 85.6, and a standard deviation of 9. Assume that a sampling distribution…

A: Standard error of mean measures the precision of the mean of the sample with the true mean of the…

Q: sample of n=400 observations is drawn from a population with mean μ=1,000 and σ=400. Find the…

A:

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: Grades on a standardized test are known to have a mean of 990 for students in the United States. The…

A: When we utilize the sample standard deviation (S), the t-distribution with n-1 degrees of freedom is…

Q: 36 Out of 100 persons interviewed are familiar with the tax incentive given by the governmenti for…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer one question at a…

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: ns. 35

A:

Q: A carpet company advertises that it will deliver your carpet within 15 days of purchase. A sample of…

A: The level of significance is defined as the likelihood of wrongly rejecting the null hypothesis when…

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

A: *SOLUTION :-

Q: If you wish to estimate with 95% confidence level the average number of miles that students living…

A: Econometrics is a study that applies the theoretical economic models to the useful tools to be used…

Q: A random sample of residents from various income brackets was asked their opinion on tax reform for…

A:

Q: The average and standard deviation of the amount of GST paid by all sole trader businesses in…

A:

Q: A sample of 150 students at University of Sussex has a mean income of £62 per week with a standard…

A: Confidence Interval: A confidence interval is a range of values that is computed from a sample of…

Q: onsider the following data: −11,−5,−5,−11,13,−11,−5−11,−5,−5,−11,13,−11,−5 Copy Data Step 2 of 3:…

A:

Q: High-power experimental engines are being developed by the Stevens Motor Company for use in its new…

A: The objective of the question is to calculate a confidence interval for the average maximum…

Q: Hinta) Check My Work nual starting salaries for college graduates with degrees in business…

A: Standard deviationIn economics, the standard deviation is a statistical measure commonly utilized to…

Q: Data on fifth-grade test scores (reading and mathematics) for 420 school districts in California…

A: P-value is an important concept used widely in statistics and econometrics. It measures the…