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Anarel [89]
3 years ago
10

Several weeks ago an article appeared in the press comparing the Fit Bit exercise monitor to the Garmin monitor. In fact, earlie

r reports suggested that the Fit Bit monitor was inaccurate in a number of its readings.You are a statistician who has been asked to compare the Fit Bit tracker to the Garmin tracker to see if there are significant differences between them. The variable you are interested in studying is the number of steps an individual takes during the day when wearing one of these trackers. You are being asked to construct a study for this question. Please write out your answers to the following questions. You have not undertaken the survey as of yet, so all you have to provide is a plan.How large a sample would you consider taking for each tracker? In other words you have to decide n1 and n2.What would your null and alternative hypotheses be?Are you conducting a dependent or independent test?What reading would you record for each member of your sample?Would you have any restriction on the individuals included in your sample? Would you restrict them by age, weight, athleticism? Why?Do you think you would know the standard deviations for each population (tracker)? What should be done about this?Now suppose the question changes and you are asked by a medical society to measure the effectiveness of the Fit Bit tracker. Your question would be does use of the Fit Bit tracker lead its users to lose weight?What test would you suggest conducting here? Would you use two independent samples or a dependent sample? Why?What data would you collect?What would your null and alternative hypotheses be?
Mathematics
1 answer:
MAXImum [283]3 years ago
6 0

Answer:

thank you for replying

Step-by-step explanation:

thank you for replying

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Hey! I’m struggling and need help! Thank you!
Charra [1.4K]

Answer:

That would be obtuse

Step-by-step explanation:

Those are all more than 90 degrees!

4 0
2 years ago
If I have 4 1/2 yards of rope and then I need 6 2/3 yards of rope how much do I need
Kobotan [32]

Answer:

Step-by-step explanation:

7 0
3 years ago
A child got 16.67/20 on a test. what is their grade in percent form?​
solong [7]

Answer:

83.4% or 83%

Step-by-step explanation:

when trying to find a percent, divide the numerator (# of correct answers) by the denominator (# of total questions possible to get correct)

Which would be 16.67 divided by 20 which equals .8335. Move the decimal point over two placements which would be 83.35. I rounded it up to 83.4. If trying to find a whole number not a decimal it would be 84%. Depending on the grading scale, it would be a B.

3 0
2 years ago
A laptop producing company also produces laptop batteries, and claims that the batteries
gregori [183]

Answer:

There is enough evidence to support the claim that the batteries power the laptops for significantly less than 4 hours. (P-value = 0).

The null and alternative hypothesis are:

H_0: \mu=4\\\\H_a:\mu< 4

Step-by-step explanation:

<em>The question is incomplete: To test this claim a sample or population standard deviation is needed.</em>

<em>We will estimate that the sample standard deviation is 2 hours, and use a t-test to test that claim.</em>

<em> NOTE (after solving): The difference between the sample mean and the mean of the null hypothesis is big enough to reject the null hypothesis, even when we have a sample standard deviation of 3.5 hours, which can be considered bigger than the maximum standard deviation for the sample.</em>

This is a hypothesis test for the population mean.

The claim is that the batteries power the laptops for significantly less than 4 hours.

Then, the null and alternative hypothesis are:

H_0: \mu=4\\\\H_a:\mu< 4

The significance level is 0.05.

The sample has a size n=500.

The sample mean is M=3.5.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=2.

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

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{2}{\sqrt{500}}=0.0894

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{3.5-4}{0.0894}=\dfrac{-0.5}{0.0894}=-5.5902

The degrees of freedom for this sample size are:

df=n-1=500-1=499

This test is a left-tailed test, with 499 degrees of freedom and t=-5.5902, so the P-value for this test is calculated as (using a t-table):

P-value=P(t

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

The null hypothesis is rejected.

There is enough evidence to support the claim that the batteries power the laptops for significantly less than 4 hours.

5 0
3 years ago
Triangle angle - sum theorem<br> what is the value of y?
dangina [55]

Answer:

y = 5

Step-by-step explanation:

All angle measures in a triangle add up to 180°.

  • This means that 63 + 82 + 7y = 180

<u>Solving for Y:</u>

Step 1: Combine like terms.

  • (7y) + (63+82)=180
  • 7y + 145 = 180

Step 2: Subtract 145 from both sides.

  • 7y + 145 - 145 = 180 - 145
  • 7y = 35

Step 3: Divide both sides by 7.

  • \frac{7y}{7} = \frac{35}{7}
  • y = 5

Step 4: Check if solution is correct.

  • 7(5) + 63 + 82 = 180
  • 35 + 63 + 82 = 180
  • 98 + 82 = 180
  • 180 = 180

Therefore, y = 5.

Have a lovely rest of your day/night, and good luck with your assignments! ♡

3 0
2 years ago
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