Question

The owner of a local grocery chain claims that the true mean checkout time for customers is less than 12 minutes. In order to test her claim she took a random sample of 64 customers and obtained the sample mean checkout time of 11.4 minutes with a standard deviation of 2.4 minutes. Find the P-Value if we are testing the pair of hypotheses H0 : µ = 12 Ha : µ < 12

0.1587

0.5

0.0228

0.1915

Answer #1

The amount of time in minutes that it took to complete a
grocery store checkout for a sample of 5 transactions is shown
below:
Checkout time- 2, 11, 1, 6, 5
Compute the 60th percentile. What does this value mean?
What is the variance?
what is standard deviation?

Suppose that the checkout time at a grocery store is an
exponential random variable with mean 3 minutes. Estimate the
probability that a cheker will serve more than 82 customers during
a 5 hour shift

1. Suppose that the checkout time at a grocery store is an
exponential random variable with mean 2 minutes. Estimate the
probability that a cheker will serve more than 223 customers during
an 8 hour shift.
2.
Suppose that we roll a die 205 times. What is the approximate
probability that the sum of the numbers obtained is between 691 and
746, inclusive.

The manager of a grocery store has taken a random sample of 100
customers. The average length of time it took the customers in the
sample to check out was 4.9 minutes with a sample standard
deviation of 0.5 minutes. Conduct a test to determine whether or
not the mean waiting time of all customers is significantly more
than 5 minutes.
Use a significance level of α = 0.01.

The manager of a grocery store has taken a random sample of 100
customers. The average length of time it took the customers in the
sample to check out was 3.1 minutes. The population standard
deviation is known to be 0.5 minute. We want to test to determine
whether or not the mean waiting time of all customers is
significantly more than 3 minutes.
The test statistic is _____.
a. 1.64
b. 2.00
c. 1.96
d. .056

The weekend wait time for customers at the grocery line is
normally distributed with mean 20 minutes and standard deviation 7
minutes. In all samples of size 12, what wait time would 10% of
those sample means fall below?
how do we know if the proportion is left-tailed or right
tailed

Waiting time for checkout line at two stores of a supermarket
chain were measured for a random sample of customers at each store.
The chain wants to use this data to test the research (alternative)
hypothesis that the mean waiting time for checkout at Store 1 is
lower than that of Store 2. (12 points)
Store 1 (in Seconds)
Store 2 (in Seconds)
470
375
394
319
167
266
293
324
187
244
115
178
195
279
400
289
228...

A movie critic claims the mean run time for movies in theaters
is 100 minutes. Researchers are trying to prove that the mean run
time is actually longer than that though (Ha : µ > 100). In a
random sample of 16 movies, the mean run time was found to be 105
minutes with a sample standard deviation of 12 minutes. Assume the
population is normally distributed. At α = 0.05, is there enough
evidence to reject the movie critic’s...

The manager of a grocery store has taken a random sample of 100
customers to determine whether or not the mean waiting time of all
customers is significantly more than 3 minutes. She observes that
the average length of time it took the customers in the sample to
check out was 3.1 minutes. The population standard deviation is
known to be 0.5 minutes.
USE INFORMATION TO ANSWER THE FOLLOWING:
1A. What is the appropriate test to use for this
problem?...

The manager of a grocery store has taken a random sample of 100
customers. The average length of time it took the customers in the
sample to check out was 3.1 minutes. The population standard
deviation is known at 0.5 minutes. We want to test to determine
whether or not the mean waiting time of all customers is
significantly different than 3 minutes. Use α = 0.05.
14. The test statistic is
a. 1.96
b. 1.64
c. 2.00
d. 0.056...

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