A tech company wants to estimate the average battery life for one of their new line of laptops. In previous models, the average battery life was 5.75 hours. They believe that, due to some improvements, the average battery life for this new line is 7 hours. They collect a random sample of 100 laptops and find the average battery life is 6.23 hours with a standard deviation of 1.97 hours. Find a 99% confidence interval for the true average battery life of this laptop. Using your results, is there evidence that the average battery life has improved? If so, has it improved to be as much as 7 hours? Relate your confidence interval to the set-up of the problem and explain your reasoning.

Q: A city planner wants to estimate the average monthly residential water usage in the city. He…

A: The provided sample mean is Xˉ=3407.80\bar X = 3407.80 gallons and the population standard deviation…

Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…

A:

Q: O 0.0226 O 0.4885 O 0.5115 O 0.15 O 0.0113

A: Sample mean, Standard deviation, s= 5degrees of freedom, df= 80-1=79The null and alternative…

Q: adway Section 40 has an accident rate of 230 accident per 100 million vehicle miles VM). The mean…

A: We have given that  Sample size n = 230 Sample mean = 94 Standard deviation = 70 90 % confidence…

Q: A study of peach trees found that the average number of peaches per tree was 625.  The standard…

A:

Q: A sample of only 8 adult rhinos had an average weight of 2,500 pounds. The standard deviation for…

A:

Q: A data set includes 103 body temperatures of healthy adult humans having a mean of 98.5°F and a…

A: According to the given question A data set includes 103 body temperatures of healthy adult humans…

Q: The average weight of 36 randomly selected school buses was 4150 pounds with a standard deviation of…

A: Given data,x=4150σ=480n=36z-value at 99% confidence is Zc=2.576

Q: A financial institution wishes to estimate the mean balances owed by its credit card customers. The…

A:

Q: Fruit flies are used frequently in genetic research because of their quick reproductive cycle. The…

A: Givensample size(n)=49Mean(x)=0.8004standard deviation(sx)=0.0782confidence level=90%

Q: What is the population for which inferencing is being done? (narrative, no calculation) What is the…

A: A population is a set or group of observations associated with a certain phenomenon under…

Q: A recent study of 26 city residents showed that the time they had lived at their present address has…

A: Given, Sample size = 26 Sample mean = 10.3 Sample standard deviation = 3   Since the population…

Q: The local Health Department conducted a study in 2009 of 900 adults asking each adult the number of…

A: Given Information: Sample size (n) = 900 Sample mean (x¯) = 7.946 Standard deviation = 6.567…

Q: In a hospital, a sample of 8 weeks was selected, and it was found that an average of 529 patients…

A:

Q: Researchers conducted a study to investigate whether there is a difference in mean PEAK EXPIRATORY…

A: Solution:From the given information, asthma kids sample size is 100, sample mean is 290 and standard…

Q: The total of individual weights of garbage discarded by 17 households in one week is normally…

A:

Q: If a sample of 25 fish from my pound has mean weight 157 grams with a standard deviation of 8.3…

A: Given information Sample size(n) = 25 Sample mean = 157g Population standard deviation (σ) = 9.4 g…

Q: A large urgent care center with 4 doctors found that they can see an average of 28 patients per…

A: We have given that Sample size (n) = 41Sample mean (x̅) = 28Standard deviations (s) =…

Q: A data set includes 109 body temperatures of healthy adult humans having a mean of 98.2°F and a…

A: The random variable X follows normal distribution. The sample size is 109. The sample mean is 98.2.…

Q: A city planner wants to estimate the average monthly residential water usage in the city. He…

A: The question is about confidence interval Given : Randomly selected no. of households ( n ) = 42…

Q: The total of individual weights of garbage discarded by 15 households in one week is normally…

A: The total of individual weights discarded by 15 households is normally distributed with mean 29.7…

Q: Gary observed the fuel efficiency of his SUV. After the first 100 times he filled up the tank, he…

A:

Q: A city planner wants to estimate the average monthly residential water usage in the city. He…

A: As per guideline expert have to be answer first question only..

Q: An existing inventory for a test measuring self-esteem indicates that the scores have a standard…

A: Mean()=61standard deviation()=12sample size(n)=70confidence level=90%

Q: market research company wants to estimate the average age of car owners in a city. A random sample…

A: The formula for the confidence interval for the mean is (sample mean - E, sample mean + E), where E…

Q: A study with 81 kids revealed the amount of time they spend watching YouTube Videos has a mean of 65…

A: given data n = 81x¯ = 65s = 10.290% ci for μ = ?

Q: A food snack manufacturer samples 11 bags of pretzels off the assembly line and weighs their…

A:

Q: A city planner wants to estimate the average monthly residential water usage in the city. He…

A:

Q: A popular weight loss program claims users will lose weight each month. Linda samples 25 dieters and…

A: We have given that,  Sample mean (x̄) = 10 pounds, standard deviation (s) = 2 pounds and sample size…

Q: A data set includes 103 body temperature of healthy adult humans having a mean of 98.1F and standard…

A: It is given that sample mean is 98.1 and the standard deviation is 0.56.

Q: A random sample of 17 snowmobiles was selected, and the lifetime of the battery was measured. The…

A:

Q: The total of individual weights of garbage discarded by 17 households in one week is normally…

A: The objective of this question is to find the 99% confidence interval for the mean weight of garbage…

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

A: given data  n = 70 x¯ = 96σ = 1190% ci for μ.

Q: A random sample of 56 fluorescent light bulbs has a mean life of 645 hours and assume that the…

A: Given,sample size(n)=56sample mean(x¯)=645population standard…

Q: A researcher conducted 12 experiments to investigate the lifespan of a certain bacteria in an acidic…

A: Given : The collected data shows that the average lifespan of the bacteria is 184 hours with 10.0…

Q: We wish to estimate an average number of education years for a college student at WVC. We take a…

A: The summary of the statistics are, The degree of freedom is, Critical value: By using 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.