Find the 95 confidence interval for the mean age at which

Assignment Help Basic Statistics

Reference no: EM13620543

A psychologist claims that the mean age at which children start talking is 12.8 months. Carlos wanted to check if this claim is true. He took a random sample of 20 children and found that the mean age at which these children started talking was 13.9 months with a standard deviation of 1.8 month. Using the 5% significance level, can you conclude that the mean age at which all children will start talking is different from 12.8 months? Assume that the ages at which all children start talking have an approximately normal distribution.

a. How many degrees of freedom will you use for this problem?

b. Find the critical values for this hypothesis test

c. Find the test statistic to.

d. Find the p-value for this test

e. Use the p-value to draw a conclusion.

f. Find the 95% confidence interval for the mean age at which all children start talking.

g. Use the confidence interval to test whether the mean age at which children start talking is 12.8 months.

Reference no: EM13620543

Questions Cloud

Atanding wave is described by the wave function y : a standing wave is described by the wave function y 6sinpi2xcos100pit where x and y are in meters and t is in

Nikki gs corporations 10-year bonds are currently yielding : nikki gs corporations 10-year bonds are currently yielding a return of 6.85 percent. the expected inflation premium is

According to the census bureau 321 people reside in the : according to the census bureau 3.21 people reside in the typical american household. a sample of 25 households in

Calculate the maximum mass flow rate at the inlet condition : a refrigerant 134a at 140 kpa and -10 degree celcius is compressed by an adiabatic 16kw compressor to an exit state of

Find the 95 confidence interval for the mean age at which : a psychologist claims that the mean age at which children start talking is 12.8 months. carlos wanted to check if this

Calculate the speed of the electrons in the water the speed : when high-energy charged particles move through a transparent medium with a speed greater than the speed of light in

When cities pass laws limiting the rent landlords can : when cities pass laws limiting the rent landlords can charge on apartments the laws usually apply to existing buildings

An ambulance moving at 42 ms sounds its siren whose : an ambulance moving at 42 ms sounds its siren whose frequency is 450hz. a car is moving in the same direction as the

Seawater contains gold too at about 1 part per trillion by : ore from gold mines is about 0.02 gold by mass. seawater contains gold too at about 1 part per trillion by volume. gold

User Account

All Pages