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Molodets [167]
3 years ago
13

The number of patients treated at Dr. Artin’s dentist office each day was recorded for nine days. These are the data: 6, 6, 6, 5

, 5, 6, 5, 6, 5. Find the mean, median, mode, and range of the data. If necessary, round to the nearest tenth.
Mathematics
1 answer:
Sholpan [36]3 years ago
5 0
Mean is all the numbers added divided my the number of numbers
6+6+6+5+5+6+5+6+5/9
5.55
median is the middle number
6
mode is the number that occurs the most
6
Range is the maximum minus the minimum
6-5
1
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a. Assume that the population has a normal distribution.

b. The 90% confidence interval of the mean sale time for all homes in the neighborhood is between 219.31 days and 240.69 days.

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We have to assume normality.

Question b:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.9}{2} = 0.05

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.05 = 0.95, so Z = 1.645.

Now, find the margin of error M as such

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In which \sigma is the standard deviation of the population and n is the size of the sample.

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The 90% confidence interval of the mean sale time for all homes in the neighborhood is between 219.31 days and 240.69 days.

7 0
3 years ago
Liz earns a salary of $2,200 per month, plus a commission of 6% of her sales. she wants to earn at least $2,900 this month. ente
nlexa [21]
2200 + 0.06s > = 2900.....with s representing her total sales
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0.06s > = 700
s > = 700 / 0.06
s > = 11666.67 <== her sales has to be at least this
6 0
3 years ago
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