2. Two stores at SM Downtown are selling batteries for cell phones. Store A claims an average battery life of 12 hours while Store B advertises an average of 14 hours. Why would we need to know the standard deviation of the battery life before deciding what brand to buy? Suppose the standard deviation are 1.5 hours for A and 1 hour for B, which battery is more likely to last all day?

Q: A random sample of 57 chemists from Washington state shows an average salary of $42635, the…

A: Let μ1 denotes the population mean salary for Washington state, and μ2 denotes the population mean…

Q: The heights of adult men in America are normally distributed, with a mean of 69.7 inches and a…

A:

Q: A random sample of 42 chemists from Washington state shows an average salary of $46283, the…

A: The question is about hypo. testing Given : Randomly selected no. of chemists from "WS"  ( n1 ) = 42…

Q: 1) A company reports that the mean weight of yearling Angus steers is 1152 pounds with a standard…

A: We have given that  X~N(mu, sigma^2) mu=1152 ,sigma =84 Z-score =(x-mu )/sigma    Note :-According…

Q: maximum weight= -lbs

A: For men working for company Has mean 177 lbs  and standard deviation of 27 lbs. There are 14 men are…

Q: A health psychologist is interested in the potential effect that a change in career focus can have…

A: Let the systolic blood pressure be denoted by X. Given: X~N142, 132 sample size (n) used: 23 sample…

Q: Two engineers were asked to estimate the average life of their company's batteries. Engineer 1 set…

A:

Q: Use a = 0.10. Construct a 90% confidence interval on the difference in means. O a. Cl on the mean:…

A: It is given that  Sample mean, x̅1 = 18 Sample mean, x̅2 = 24 Population standard deviations, σ1 =…

Q: Wyatt earned a score of 670 on Exam A that had a mean of 750 and a standard deviation of 50. He is…

A: Here both exam A and exam B are normally distributed. We need to find the marks required in exam B…

Q: The speeds on Highway 401 east of Toronto average 110 km/hr with a standard deviation of 7.1 km/hr…

A: Highway 401 Coefficient of variation = 6.5% Toronto's city streets Coefficient of variation =…

Q: Database A contains 40 data items and is made up with an equal number of the values of 0 and 100 and…

A: We have given that  Database A: n1=40 , Mean=50,made up with an equal number of the values of 0 and…

Q: Database A contains 40 data items and it's made up with an equal number of values of 0 and 100 and…

A:

Q: Both data sets have a mean of 195. One has a standard deviation of 16, and the other has a standard…

A: Given the box plot of data sets A and B, we use the key: 15|8=158. And also given that both data…

Q: A health psychologist is interested in the potential effect that a change in career focus can have…

A: We hvae to find  point estimate for the mean systolic blood pressure for divorce lawyers who switch…

Q: Both data sets have a mean of 175. One has a standard deviation of 16, and the other has a standard…

A: The stem-and-leaf plots are given and the one has a standard deviation of 16 and other has a…

Q: Consider two investment options: Stock A and Stock B. Every $100 invested in Stock A yields a return…

A: The standard deviation for the portfolio is a function of the standard deviations of the assets that…

Q: A painter purchases two types of paints, paint A and paint B. The amount of paint A purchased per…

A: Expected amount spent by firm on both types of paints combined is as follows…

Q: obiles? Assume the samples are random and independer dard normal distribution table. dard normal…

A: Let μ1 denote the mean braking distance of automobile A. Let μ2 denote the mean braking distance of…

Q: A businessman calculated the average price of variety A rice per kilo at ₱32.00 with a standard…

A: First calculate sample mean and sample standard deviation for rice B varieties using Excel

Q: once, so that they na standard deviat

A: Alex cuts four sticks one at a time and their lengths are independent  with mean = 8 and Standard…

Q: The deaths attributed to UV radiation have a mean of 141.5 with a standard deviation of 92.1.…

A: Mean = 141.5 Standard deviation = 92.1 Raw score = 343

Q: Two different species of trees have heights that are approximately normal in distribution. Tree A…

A: Given that Tree A has a mean of 36 feet and a standard deviation of 3 feet.   Tree B has a mean of…

Q: weighs 170 lbs with a standard deviation of 8 lbs and the average female tennis player weighs 125…

A:

Q: A fitness company is building a 20-story high-rise. Architects building the high-rise know that…

A: GIVEN DATA, normal distribution ,women μ=143σ=29menμ=169σ=35assuming a worst case scenario of 18…

Q: Database A contains 40 data items and is made up with an equal number of the values of 0 and 100 and…

A: Measure of central tendency measures the central or average value of a dataset. Measured of…

Q: A psychologist who needs two groups of students for a learning experiment decides to select a…

A: Hi! Thank you for the question. AS per the honor code, we are allowed to answer the three sub-parts…

Q: he director of research and development is testing a new medicine. She wants to know if there is…

A: Here it is given that- Total number of samples(n) = 34 Mean(x)¯ = 320 Standard deviation(δ) = 24

Q: Which of these statements is best?       The variable to be predicted is the independent variable.…

A: Which of these statements is best?       The variable to be predicted is the…

Q: A manufacturer of calculator batteries claims that the mean length of life for its battery is 500…

A: The empirical graph is, The random variable X is defined as the length of life for its battery. The…

Q: Suppose a shopkeeper is making bags of 2 pounds of flou bulk. The shopkeeper keeps adding flour to a…

A: Given that.   X~N( μ , ?)   μ=2 , ?=0.08   Z-score =( x - μ )/?

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a…

A: Given that  α=0.10That is,α=10%Level of significance =10%

Q: A cohort of patients have lost on average 23 pounds and the standard deviation of the sample is 1.2…

A: We have been given that a cohort of patients have lost on average 23 pounds and the standard…

Q: A statistics instructor gives two different tests to measure students' aptitude for statistics.…

A: We have given that, Mean1 = 22 and standard deviation1 = 5. Mean2 = 71 and standard deviation2 =…

Q: health psychologist is interested in the potential effect that a change in career focus can have on…

A:

Q: Americans (on average) individually eat 16 pounds of seafood each year with a standard deviation of…

A: Given that   x̄ = 14 , μ = 16 , ? = 7 , n = 4

Q: Morgan earned a score of 275 on Exam A that had a mean of 300 and a standard deviation of 25. She is…

A: