Justing has 20 pencils, 25 erasers, and 40 paper clips. He organize them into groups with the same number of items and each grou
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Answer:
Yes, evidence shows that the cream will improve the skin of more than 40% of women over the age of 50 in 0.01 significance level.
Step-by-step explanation:
We need to make a hypothesis test.
Let p be the proportion of women who used cream report skin improvement.
: p=0.4
: p<0.4
To test the hypothesis, we need to calculate z-score of the sample mean and compare its probability with the significance level.
z= where
- p(s) is the sample proportion of women reported improvement (0.5)
- p is the proportion assumed under null hypothesis. (0.4)
- N is the sample size (70)
Putting the numbers:
z= ≈ 1.71
And P(z<1.71) ≈ 0.955. Since 0.955>0.01 we fail to reject the null hypothesis that the cream will improve the skin of more than 40% of women.
The computer will cost $924.96 after 6% tax.
<h3>Total cost of laptop</h3>The initial payment of the laptop made = $150.00
The remaining balance that would be made = 12 × 69.50
=$834
Therefore total cost of laptop before tax = 834 + 150
= $984
But tax is 6% of total cost =
= $59.04
Therefore, total cost of laptop after tax = 984 - 59.04
= $924.96
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