Find the margin of sampling error e find the length of the

Reference no: EM13620669

Phone calls received by a Police dept. are normally distributed. A random sample of 16 days showed that the dept. received an average of 223 phone calls per day with a sample standard deviation of 31 calls.

a. Find a 95% confidence interval for the mean number of phone calls received each day.

b. Find the margin of sampling error E

c. Find the length of the confidence interval

d. Find a point estimate for the mean.

e. Use the confidence interval found in (d) to test whether the mean # of phone calls received is 205.

f. Use the confidence interval found in (d) to test whether the mean # of phone calls received is 220

g. Without computing the 99% CI, can you draw a conclusion (still testing whether the mean # of phone calls is 220) at the 1% significance level?

h. Without computing the 99% CI, can you draw a conclusion (now testing whether the mean # of phone calls is 205) at the 1% significance level?

Reference no: EM13620669

Questions Cloud

Heat transfer to the water continues until its pressure is : a two-phase liquid-vapor mixture a two-phase liquid-vapor mixture of water with an initial quality of 25 is contained

Te characteristic function of the cauchy distribution is : the characteristic function of the cauchy distribution is e-t determine the characteristic function of x1n?xi i1....n

Determine the approximate percentage appreciation or : determine the approximate percentage appreciation or depreciation of the nasdaq composite dow jones industrial average

At what height will the baloon be fully blown up will the : a helium baloon is used to lift something which weighs 100n. the layer of the baloon weighs 50n and the volume of the

Find the margin of sampling error e find the length of the : phone calls received by a police dept. are normally distributed. a random sample of 16 days showed that the dept.

Eventually the contents of the tanks come to equilibrium at : two uninsulated rigid tanks contain air. initially tank a hold 1 lbm of air at 1440 degrees r and tank b has 2 lbm of

Compact fluorescent lamps cfls have become more popular in : compact fluorescent lamps cfls have become more popular in recent years but do they make financial sense? suppose a

The value of w is about 424 ev for zinc what is the maximum : the value of w is about 4.24 ev for zinc. what is the maximum wavelength that light falling on the zinc can have if it

A draw a t-v diagram label the saturated temperature the : refrigerant 134a undergoes a process for which the pressure-volume relation is pvn constant. the initial and final

User Account

All Pages