The lifetime of a certain brand of battery is known to have a standard deviation of 23 hours. Suppose that a random sample of 70 such batteries has a mean lifetime of 44.6 hours. Based on this sample, find a 90% confidence interval for the true mean lifetime of all batteries of this brand. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.)

Q: The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 104…

A: We have to create 95% confidence for mean using Z statistics.

Q: The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 80…

A: For the given data Find the 90% Confidence intervals

Q: The main diastolic blood pressure for a random sample of 70 people was 88 millimeters. If the…

A: We have given that.Sample size (n) = 70Sample mean (x̅) = 88Population Standard deviations (σ) = 9…

Q: find a 95% confidence interval for the true mean diastolic blood pressure of all people. Then give…

A: It is given that Sample size n = 90 Sample mean M = 90 Population SD = 8 The critical value of Z at…

Q: The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 54…

A: It is required to obtain the 90% confidence interval for the true mean lifetime of all electric…

Q: The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 89…

A:

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 11.5 hours.…

A:

Q: You measure the blackbody temperature of the night sky three times and read: 7.3C, 9.1C, and 8.7C.…

A: Given : 1.   Temperature f night sky(in  degree celcies)    : 7.3, 9.1, and 8.7. 2.   Sample  mean =…

Q: The mean diastolic blood pressure for a random sample of 70 people was 96millimeters of mercury. If…

A: Given Data: x¯=96n=70σ=12   z-value corresponding to 99% Confidence level=2.576

Q: The mean diastolic blood pressure for a random sample of  60  people was  97  millimeters of…

A: Given: n=60x=97σ=12Confidence Level =90%

Q: The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 88…

A:

Q: You measure 94 turtles' weights, and find they have a mean weight of 70 ounces with a standard…

A: You measure 94 turtles' weights, and find they have a mean weight of 70 ounces with a standard…

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 19.8 hours.…

A: The summary of statistics is, x¯=38.5,σ=19.8,n=100 Critical values: By using the z-tables, the…

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 16 hours.…

A: Given,sample size(n)=90mean(x¯)=32.8population standard…

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 19.8 hours.…

A: Step 1: Identify the formula for the confidence interval of a population mean (μ), given that the…

Q: An office manager claims that the mean time required to handle a customer complaint is more than 30…

A: To compare the population mean with the sample mean, either t or z tests would be perform. To use t…

Q: The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 52…

A: The sample size: n=100 The sample mean: x¯=482 hours The population standard deviation: σ=52 hours…

Q: The lifetime of a certain brand of electric light bulb is known to have a standard deviation of  50…

A: Answer  a standard deviation = 50 hours. a random sample =90 a mean lifetime =488 hours.

Q: The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 94…

A:

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 16 hours.…

A:

Q: The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 87…

A: Formula :

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 16 hours.…

A: We have given that  Sample size n=60 , xbar= 44.1  Sigma= 16 90% confidence interval.

Q: You measure 29 turtles' weights, and find they have a mean weight of 70 ounces. Assume the…

A:

Q: The mean diastolic blood pressure for a random sample of 90 people was 82 millimeters of mercury. If…

A: Given that  Random sample size (n) = 90 Mean diastolic blood pressure (x¯)= 82 mmHg  Population…

Q: The mean diastolic blood pressure for a random sample of 90 people was 90 millimeters of mercury. If…

A: Given : Sample size : n=90 Sample mean : x¯=90 Population standard deviation σ=8 . Confidence level…

Q: The lifetime of a certain brand of battery is k lifetime of 35.2 hours. Based on this sample upper…

A:

Q: The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 104…

A:

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 11.5 hours.…

A:

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 9 hours. Suppose…

A:

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 23 hours.…

A:

Q: You measure the blackbody temperature of the night sky three times and read: 7.3C, 9.1C, and 8.7C.…

A: Use the given data to form the excel table:   x x-μ x-μ2   7.3 -1.06667 1.1379…

Q: The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 109…

A: Given n=70, standard deviations σ=10, sample mean x̄=1750

Q: The mean diastolic blood pressure for a random sample of 50 people was 91 millimeters of mercury. If…

A:

Q: The mean diastolic blood pressure for a random sample of 50 people was 86 millimeters of mercury. If…

A: Given that  Random sample size (n) = 50 Mean diastolic blood pressure (x¯) = 86 mmHg Standard…

Q: The mean diastolic blood pressure for a random sample of 80 people was 100 millimeters of mercury.…

A: Given  mean (x̄)  = 100 sample size (n)=80 standard deviation (s) =10 degree of freedom = df = n -1…

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 16 hours.…

A: We have given that,  Sample mean(x̄)  = 40.7  population standard deviation = 16 and sample size (n)…

Q: Suppose a certain species bird has an average weight of x = 3.2 grams. Based on previous studies we…

A: Given,   Sample size = 18 Sample mean = 3.2 Population standard deviation = 0.34   Since the…

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.