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I am Lyosha [343]
2 years ago
10

(08.01)Jenni is surveying shoppers about their use of the new customer service center in a store. Which question in her survey i

s a statistical question?
A: Who is the manager of the customer service center?

b;Where is the customer service center located in the store?

C: How many times do you visit the customer service center each month?

D: How many shoppers visited the customer service center last week?
Mathematics
1 answer:
WINSTONCH [101]2 years ago
5 0
D. the total quantity of shoppers are needed for statistical information
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A car passes a landmark on a highway traveling at a constant rate of 45 kilometers per hour.

Let t be the time taken by second car

So t+1 is the time taken by first car

Distance = speed * time

Distance traveled by first car = 45 * (t+1)

second car passes the same landmark traveling in the same direction at 65 kilometers per hour

Distance traveled by second  car = 65 * (t)

When second car overtakes the first car then their distance are same

65 t = 45(t+1)

65t = 45t + 45

Subtract 45 t from both sides

20t = 45

Divide both sides by 20

so t = \frac{45}{20}=\frac{9}{4}=2.25

It took 2.25 hours for the second car to overtake first car


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A research group wants to know if the online platform to play Settlers of Catan is being accessed more after the stay at home or
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Answer:

a) The P-value is 0.

At a significance level of 0.05, there is enough evidence to support the claim that the online platform was accessed significantly more so than before the stay at home order.

b) Effect size d = 0.77

Medium.

Step-by-step explanation:

This is a hypothesis test for the population mean.

The claim is that the online platform was accessed significantly more so than before the stay at home order.

Then, the null and alternative hypothesis are:

H_0: \mu=1000\\\\H_a:\mu> 1000

The significance level is 0.05.

The sample has a size n=108000.

The sample mean is M=1378.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=489.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{489}{\sqrt{108000}}=1.488

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{1378-1000}{1.488}=\dfrac{378}{1.488}=254.036

The degrees of freedom for this sample size are:

df=n-1=108000-1=107999

This test is a right-tailed test, with 107999 degrees of freedom and t=254.036, so the P-value for this test is calculated as (using a t-table):

\text{P-value}=P(t>254.036)=0

As the P-value (0) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

At a significance level of 0.05, there is enough evidence to support the claim that the online platform was accessed significantly more so than before the stay at home order.

The effect size can be estimated with the Cohen's d.

This can be calculated as:

d=\dfrac{M-\mu}{\sigma}=\dfrac{1378-1000}{489}=\dfrac{378}{489}=0.77

The values of Cohen's d between 0.2 and 0.8 are considered "Medium", so in this case, the effect size d=0.77 is medium.

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Jeff bought a new jacket that had a regular price of $75.99. His mom gave him a 30% off coupon. What is the price he pays includ
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  • Step-by-step explanation:
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