Question
In: Statistics and Probability
A carpet company advertises that it will deliver your carpet within 15 days of purchase. A...
A carpet company advertises that it will deliver your carpet within 15 days of purchase. A sample of 49 past customers is taken. The average delivery time in the sample was 16.2 days. Assume the population standard deviation is known to be 5.6 days.
- State the null and alternative hypotheses.
- t-test or z-test?
- Calculate test statistic
- Using a critical value, test the null hypothesis at the 5% level of significance. State conclusion.
In the past the average age of employees of a large corporation has been 40 years. Recently, the company has been hiring older individuals. In order to determine whether there has been an increase in the average age of all the employees, a sample of 25 employees was selected. The average age in the sample was 45 years with a standard deviation of 5 years. Assume the distribution of the population is normal. Let a = .05.
- State the null and the alternative hypotheses.
- z-test or t-test?
- Test to determine whether or not the mean age of all employees is significantly more than 40 years (You may pick which method). State conclusion in a full sentence.
Solutions
orchestra answered 1 year agoRelated Solutions
A carpet company advertises that it will deliver your carpet within 15 days of purchase. A...
A carpet company advertises that it will deliver your carpet
within 15 days of purchase. A sample of 49 past customers is taken.
The average delivery time in the sample was 16.2 days. The standard
deviation of the population ( σ) is known to be 5.6 days.
a. State the null and alternative hypotheses for a test to
determine if their advertisement is legitimate.
b. Using the critical value approach, test the hypotheses. Let α
= .05.
c. Using the...
A carpet company advertises that it will deliver your carpet within 15 days of purchase. A...
A carpet company advertises that it will deliver your carpet
within 15 days of purchase. A sample of 49 past customers is taken.
The average delivery time in the sample was 16.2 days. Assume the
population standard deviation is known to be 5.6 days.
a.
State the null and alternative hypotheses.
b.
Using a critical value, test the null hypothesis at the 5% level
of significance.
c.
Using a p-value, test the hypothesis at the 5% level of
significance.
d....
A carpet company advertises that it will deliver your carpet within 6 days of purchase. A...
A carpet company advertises that it will deliver your carpet
within 6 days of purchase. A sample of 46 past customers is taken.
The average delivery time in the sample was 6.8 days. The
population standard deviation is known to be 2.7 days.
Test to determine if their advertisement is legitimate at
a significance level 0.01. (Show all
steps)
A catalog sales company promises to deliver orders placed on the Internet within 3 days. Follow-up...
A catalog sales company promises to deliver orders placed on the
Internet within 3 days. Follow-up calls to a few randomly selected
customers show that a 90% confidence interval for the proportion
of all orders that arrive on time is 88% ±4%. What does this
mean? Are the conclusions below correct? Explain.
a) Between 84%
and 92%
of all orders arrive on time.
b)
90% of all random samples of customers will show that 88%
of orders arrive on time....
The number of days required for two suppliers to deliver orders is as follows. Supplier A:...
The number of days required for two suppliers to deliver
orders is as follows.
Supplier A:
10.0
4.0
13.0
1.0
17.0
7.0
11.0
16.0
6.0
19.0
Supplier B:
9.0
4.0
13.0
2.0
23.0
8.0
12.0
15.0
6.0
24.0
(A) Which supplier provides more consistent and
homogenous delivery times A or B? ...
Average Number of Days for Supplier A = days,
and Standard Deviation = day.
Coefficient of Variation for Supplier A =
Average Number of Days for Supplier B = days,
and...
The number of days required for two suppliers to deliver orders is as follows. Supplier A:...
The number of days required for two suppliers to deliver
orders is as follows.
Supplier A:
10.0
4.0
13.0
1.0
17.0
7.0
11.0
16.0
6.0
19.0
Supplier B:
9.0
4.0
13.0
2.0
23.0
8.0
12.0
15.0
6.0
24.0
(A) Which supplier provides more consistent and
homogenous delivery times A or B? ...
Average Number of Days for Supplier A = days,
and Standard Deviation = day.
Coefficient of Variation for Supplier A =
Average Number of Days for Supplier B = days,
and...
On May 15, Helena Carpet Inc., a carpet wholesaler, issued for cash 746,000 shares of no-par...
On May 15, Helena Carpet Inc., a carpet wholesaler, issued for
cash 746,000 shares of no-par common stock (with a stated value of
$1.30) at $4.40, and on June 30, it issued for cash 17,500 shares
of preferred stock, $50 par at $61.
Required:
a. Journalize the entries for
May 15 and June 30, assuming that the common stock is to be
credited with the stated value. Refer to the Chart of Accounts for
exact wording of account titles.
b....
An insurance company states that at least 85% of its claims are settled within 30 days.
4) (1 point) An insurance company states that at least 85% of
its claims are settled within 30 days. A consumer group selected a
random sample of 66 of the company's claims to test this statement.
They found that 55 of the claims were settled within 30 days. Does
the consumer group have evidence to disbelieve the insurance
company's claim?
1. Write the hypotheses to test if the rate of
claims settled within 30 days is less than 85%.
H0H0:...
If a company has a cash-conversion cycle of 15 days, an average age of inventory of...
If a company has a cash-conversion cycle of 15 days, an average
age of inventory of 40 days and an average payment period of 60
days, calculate the average collection period.
1. Seams Personal advertises on its website that 95% of customer orders are received within four...
1.
Seams Personal advertises on its website that 95% of customer
orders are received within four working days. They performed an
audit from a random sample of 500 of the 6,000 orders received that
month and it shows 470 orders were received on time.
(Question) If Seams Personal customers really receive 95% of
their orders within four working days, what is the probability that
the proportion in the random sample of 500 orders is the same as
the proportion found...
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