Asimple random sample of size nequals 81 is obtained from a population with mu equals 81 and sigma equals 18 . ? (a) describe the sampling distribution of x overbar . ? (b) what is upper p left parenthesis x overbar greater than 84.1 right parenthesis ? ? ? (c) what is upper p left parenthesis x overbar less than or equals 76.2 right parenthesis ? ? ? (d) what is upper p left parenthesis 79.3 less than x overbar less than 84.6 right parenthesis ? ? ? (a) choose the correct description of the shape of the sampling distribution of x overbar . a. the distribution is skewed right. b. the distribution is approximately normal. c. the distribution is skewed left. d. the distribution is uniform. e. the shape of the distribution is unknown. find the mean and standard deviation of the sampling distribution of x overbar . mu subscript x overbar equals sigma subscript x overbar equals

NOrmal distribution

Step-by-step explanation:

As per central limit theorem sample mean follows a normal distribution for large samples drawn at random.

a) X bar follows a normal distribution with mean = 81 and std error =

b)

c)

Symmetrical

B. The distribution is approximately normal.

this story was prepared by jim

mccullaugh in los angeles and

al stewart in new york.

new york the colossal success of "top gun" appears to have dramatically altered madison avenue's

perception of corporate sponsorship

of home video projects.

the paramount home video re- lease, featuring a 60- second diet

pepsi spot, was by no means the

first prerecorded video to carry an advertiser's plug, but it was the

first major theatrical release to do so. in the aftermath of the title's

success, paramount is widely ex- pected to ink a similar deal for

"crocodile dundee" or "star trek

iv" or both.

corporate america's new attraccds push british

recording sales

to 19% gain

london fueled by the compact

disk boom, the value of u.k. manu- facturer shipments of recordings

rose 19% in the 12 -month period ended march 1987, according to the

british phonographic industry.

total value of u.k. shipments for

the period was $755 million for all

configurations. (all value figures

are based on an exchange rate of

$1.68 to the pound sterling.)

cd sales totaled 10.7 million units

worth $121.3 million- compared

with 3.7 million units worth $39.5

million in the prior 12 months -and

accounted for two -thirds of the

overall gain in trade value. at present growth rates, says the bpi, cd

sales for calendar 1987 will reach 20

(continued on page 79)

step-by-step explanation:

17

step-by-step explanation: