Find significant increase in battery life expectancy

Assignment Help Basic Statistics

Reference no: EM13139375

A producer of various kinds off batteries has been producing "D" size batteries with a life expectancy of 87 hours. Due to an improved production process, management believes that there has been an increase in battery life expectancy. A sample of 36 batteries showed an average life of 88.5 hours. If the standard deviation of the population is 9 hours, determine whether there has been a significant increase in battery life expectancy.

Reference no: EM13139375

Questions Cloud

Locations of believers in the world : Distinguish among Shiite Islam, Sunni Islam, and Sufism. Give origin, major locations of believers in the world, estimate percentage of group compared to total number in religion, and major tenets of the groups beliefs.

Switch to a calendar-year tax year : Gamma Corporation, as S corp. has a fiscal year ending 03-31. It is required to switch to a calendar-year tax year. How many months of income would a calendar-year taxpayer be required to report in the year of change?

How long is the wire : A copper wire (density = 8.96 g/cm3) has a diameter of 0.27 mm. If a sample of this copper wire has a mass of 35 g, how long is the wire?

Which of these statements is true of sponges : Which of these statements is true of sponges? A) They have an open circulatory system. B) They are segmented animals. C) They have no true tissues. D) Food is digested within a gastrovascular cavity. E) They are pseudocoelomates.

Find significant increase in battery life expectancy : If the standard deviation of the population is 9 hours, determine whether there has been a significant increase in battery life expectancy.

What term best characterizes the type of mutation exhibited : Wild-type E. coli grow best at 37 but can grow efficiently up to 42 . An E. coli strain has a mutation of the sigma subunit that results in an RNA polymerase holoenzyme that is stable and transcribes at wild-type levels at 37 .

What is the minimum mass of nahco3 that must be added : If 32mL of 7.0M H2SO4 was spilled, what is the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid?

Problem related to budgeted net income : The Adams Company, a merchandising firm, has budgeted its activity for November according to the following information: The budgeted net income for November is

What is the minimum number of such crossover events : To integrate an F plasmid's genes into a host chromosome, there must be DNA recombination at homologous regions on the two circular strands. What is the minimum number of such crossover events needed for integration?

User Account

All Pages