Question

Find the number z such that proportion of observations that are less than z in a standard normal distribution is 0.6. ?

find the number z such that 15% of all observations from a standard normal distribution are greater than z ?

Answer #1

Find the number z such that proportion of observations that are less than z in a standard normal distribution is 0.6. ?

P( z < 0.253) =0.6

**Required z= 0.253**

find the number z such that 15% of all observations from a standard normal distribution are greater than z ?

P( z > 1.036 ) =0.15

**Required z= 1.036**

(a) Find ? such that the proportion of observations that are
less than ? in a standard normal distribution is 0.34. (Enter your
answer rounded to two decimal places.)
?=
(b) Find ? such that 34% of all observations from a standard
normal distribution are greater than ?. (Enter your answer rounded
to two decimal places.)
?=

(a) Find such that the proportion of observations that are less
than in a standard normal distribution is 0.24. (Enter your answer
rounded to two decimal places.)

Assume that the data has a normal distribution and the number of
observations is greater than fifty. Find the critical z value used
to test a null hypothesis. a=.09 for a right-tailed test
i need extensive step by step please show all work

(1 point) Use the value of from Table A that comes closest to
satisfying the condition.
(a) Find the number zz such that the proportion of observations
that are less than zz in a standard Normal distribution is
0.3174.
(b) Find the number zz such that 93.88% of all observations from a
standard Normal distribution are greater than zz.
(a)
(b)

-For a Normal distribution with μ=5.5 and σ=1.4
What proportion of observations have values less than 2? (Round to
4 decimal places)
-A manufacturer knows that their items lifespans are normally
distributed according to N(9.3,1.4)N(9.3,1.4).
What proportion of the items' lifespans will be longer than 11
years?

QUESTION 1:
The proportion of observations from a standard Normal
distribution that take values less than -0.98 is about?
QUESTION 2:
In a study of exercise, a large group of male runners walk on a
treadmill for 6 minutes. Their heart rates in beats per minute at
the end vary from runner to runner according to the N(104,
12.5) distribution. The heart rates for male nonrunners after the
same exercise have the N(131, 16.6) distribution.
(a) What percent (±±0.1) of...

If Z is a standard normal variable, find the
probability.
The probability that z is less than 0.8.
0.7881 b. 0.2119 c. 0.4681 d. 0.5319
The probability that z lies between 0.61 and 2.25.
0.7413 b. 0.2831 c. 0.2587 d. 0.7169
The probability that z is greater than -2.47.
0.0068 b. 0.0685 c.
0.9932 d. 0.9315
The graph below shows a standard normal distribution. Find the
z-score associated with the shaded area. The area of the shaded
region is 0.0694.
1.37 b. 1.48 c. 1.26 d. 1.01
The graph below shows a standard normal distribution. Find the
z-score associated with the shaded area....

r. Garcia is interested in evaluating the proportion of all
Aggie undergraduates who get less than 8 hours of sleep per night.
She conducted a survey of 100 undergraduates at Texas A&M found
that 60 of them get less than 8 hours sleep per night.
Provide a 99% confidence interval of the population proportion.
Selected Answer:
0.6 +/- 1.645 s /100 where s is the sample
standard deviation of sleep.
Answers:
0.6 +/- 1.645 s /100 where s is the...

1.) If a z-score is larger than _________ it is considered
extreme.
a. +/- 2
b. +/- 0.05
c. +/- 1.64
d. +/- 1.25
2.) For a population with µ = 200 and σ = 25, the distribution
of sample means (based on samples of size n = 25) will have a mean
of _______ and a standard error of _______.
3.) A normal distribution has μ = 70 and σ = 10.
What is the probability of randomly selecting...

Use Table A to find the proportion of observations from a
standard Normal distribution that satisfies each of the following
statements. Enter your answers rounded to four decimal places.
a) ?<−0.46=
b) ?>−1.51=
c) ?<2.21=
d) −0.46<?<2.21=

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