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kati45 [8]
3 years ago
14

Convert the mixed number to an improper fraction

Mathematics
1 answer:
Goryan [66]3 years ago
5 0
The answer is b. Multiply 8 by 6 then add 7. Hope it helps.
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A manager of a grocery store wants to determine if consumers are spending more than the national average. The national average i
strojnjashka [21]

The valid conclusions for the manager based on the considered test is given by: Option

<h3>When do we perform one sample z-test?</h3>

One sample z-test is performed if the sample size is large enough (n  > 30) and we want to know if the sample comes from the specific population.

For this case, we're specified that:

  • Population mean = \mu = $150
  • Population standard deviation = \sigma = $30.20
  • Sample mean = \overline{x} = $160
  • Sample size = n = 40 > 30
  • Level of significance = \alpha = 2.5% = 0.025
  • We want to determine if the average customer spends more in his store than the national average.

Forming hypotheses:

  • Null Hypothesis: Nullifies what we're trying to determine. Assumes that the average customer doesn't spend more in the store than the national average. Symbolically, we get: H_0: \mu_0 \leq \mu = 150
  • Alternate hypothesis: Assumes that customer spends more in his store than the national average. Symbolically H_1: \mu_0 > \mu = 150

where \mu_0 is the hypothesized population mean of the money his customer spends in his store.

The z-test statistic we get is:

z = \dfrac{\overline{x} - \mu_0}{\sigma/\sqrt{n}} = \dfrac{160 - 150}{30.20/\sqrt{40}} \approx 2.094

The test is single tailed, (right tailed).

The critical value of z at level of significance 0.025 is 1.96

Since we've got 2.904 > 1.96, so we reject the null hypothesis.

(as for right tailed test, we reject null hypothesis if the test statistic is > critical value).

Thus, we accept the alternate hypothesis that customer spends more in his store than the national average.

Learn more about one-sample z-test here:

brainly.com/question/21477856

3 0
1 year ago
Read 2 more answers
Which values are solutions to the inequality below? check all that apply
Aleonysh [2.5K]

Answer:

Step-by-step explanation:

THE ANSWER IS 9

6 0
3 years ago
Please help!!!! Whoever answers these three questions correctly first will get brainliest answer!!!!!
inna [77]
4. -8
5. 24
6. I can't see it properly so if it's ÷ answer is 9 if it's - answer is -70
4 0
2 years ago
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If f(x) = 8, what is f(x) when x = 10?
poizon [28]
F(x) = 8.

This is a constant function. No matter the value of x, f(x) will always be = 8

Therefore when x = 10,   f(x) = 8.
4 0
3 years ago
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What is 3 x 4/5 equal too?
sineoko [7]
12/5 is the answer!

Hope I helped!
Ps: symbolab.com is a great calculator to help solve those type of problems :-)
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3 years ago
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