Question

- Explain when you would use the “z” table to determine distance from the center point on the curve and when you would use the “t” table?
- Explain how the significance level relates to the validity of the null hypothesis?

Answer #1

1. As we prepare to discuss confidence levels and make decision,
we are using the mean as the bases for our central point. Why are
we able to do this and what are some of the parameters we must
consider?
2. We discussed confidence levels in Chapter 8 and Hypothesis
testing in Chapter 9. What are the common elements of each? When
would you use one or the other?
3. Explain when you would use the “z” table to determine...

how
do i know when to use z table t table x^2 table?

4. What is the difference between “z” and “t” statistics? When
do we use z-table, and when do we use t-table?

You would like to
determine if the population probability of success differs from
0.70. You find 62 successes in 80 binomial trials. Implement the
test at the 1% level of significance. (You may find it
useful to reference the appropriate table: z table
or t table)
a.
Select the null and the alternative hypotheses.
H0: p = 0.70;
HA: p ≠ 0.70
H0: p ≤ 0.70;
HA: p > 0.70
H0: p ≥ 0.70;
HA: p < 0.70
b.
Calculate...

Find an expression for the boiling point of water as a function
of z, the distance above sea level. You can assume the temperature
at sea level is 300 K and the temperature is independent of height
above sea level. Then, use this to find the boiling
point of water
a) At the top of Mt. Sagarmatha
(Everest)
b) At the bottom of the Dead Sea
c) In an airplane flying at 30,000
ft.

If manufacturer would like to minimise the probability of
rejecting the null
hypothesis when it is in fact true, which level of significance
would you recommend, the
1 percent or the 5 percent significance level? Explain why.

Determine the following standard normal (z) curve
areas. (Use a table or technology. Round your answers to four
decimal places.)
(a)
the area under the z curve to the left of 1.73
(b)
the area under the z curve to the left of −0.66
(c)
the area under the z curve to the right of 1.20
(d)
the area under the z curve to the right of −2.81
(e)
the area under the z curve between −2.23 and 0.56
(f)...

The commonly used critical Z values are 1.645 for a 90%
confidence interval (or 2-tailed, .10 level of significance), 1.96
for 95% confidence and 2.58 for 99% confidence. If a different
confidence level is required, such as 92%, how can you determine
the critical Z value?
What is the relationship between the confidence level and the
level of significance of a 2-tail test?
Which Hypothesis Tests use Z distributions?
Which Hypothesis Tests use a Student’s t distribution?
Which Hypotheses Tests...

Explain how you would use kinematic equations
to calculate the horizontal range of a projectile when the cannon
is elevated some distance above the x-axis.

Using the 6 steps to hypothesis testing, Conduct a Z test to
determine if The dosage of Ritalin has an effect on attention
span.
IV = Ritalin (10mgs vs 20mgs)
DV = Attention span (measured in minutes)
Given the harmful side effects conduct a Z-test at the p=.01
level.
Mean for 10 milligram group = 12.3 minutes, Mean for 20
milligram group =13.3 minutes
Standard error of the difference is = .6 minutes
Write out Null and Research Hypotheses
Use...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 10 minutes ago

asked 11 minutes ago

asked 15 minutes ago

asked 18 minutes ago

asked 18 minutes ago

asked 21 minutes ago

asked 37 minutes ago

asked 38 minutes ago

asked 43 minutes ago

asked 43 minutes ago

asked 47 minutes ago