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1 year ago

13

A share of stock in a pharmaceutical company was worth $30.46 on Monday. On Wednesday, the stock price changed to $45.83. What i

s the net change in the stock price from Monday to Wednesday?

2 answers:

mestny [16]1 year ago

7 0

15.37 dollars. You get this answer by subtracting 45.83 minus 30.46

Usimov [2.4K]1 year ago

3 0

Looks to me like ur sales tax is 9% and ur instant rebate is 30 bucks

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In measuring reaction time, a psychologist estimates that a standard deviation is .05 seconds. How large a sample of measurement

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97

Step-by-step explanation:

We are asked to find the size of sample to be 95% confident that the error in psychologist estimate of mean reaction time will not exceed 0.01 seconds.

We will use following formula to solve our given problem.

$n\geq (\frac{z_{\alpha/2}\cdot\sigma}{E})^2$ , where,

$\sigma=\text{Standard deviation}=0.05$ ,

$\alpha=\text{Significance level}=1-0.95=0.05$ ,

$z_{\alpha/2}=\text{Critical value}=z_{0.025}=1.96$ .

$E=\text{Margin of error}$

$n=\text{Sample size}$

Substitute given values:

$n\geq (\frac{z_{0.025}\cdot\sigma}{E})^2$

$n\geq (\frac{1.96\cdot0.05}{0.01})^2$

$n\geq (\frac{0.098}{0.01})^2$

$n\geq (9.8)^2$

$n\geq 96.04$

Therefore, the sample size must be 97 in order to be 95% confident that the error in his estimate of mean reaction time will not exceed 0.01 seconds.

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