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3 years ago

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taci is attending a music festival. The ticket to the festival costs $87.96. Staci plans to purchase $30.00 t-shirts from the ev

ent for close friends. She is taking $200.00 to the festival. What is the maximum number of t-shirts Staci can purchase?

2 answers:

Fantom [35]3 years ago

6 0

3 t-shirts is how much

Oksi-84 [34.3K]3 years ago

4 0

She can purchase 3 t-shirt :)

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Read 2 more answers

A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which are defective. Step 2 of 2 :

Diano4ka-milaya [45]

Answer: (0.120,0.160)

Step-by-step explanation:

Given : Sample size : $n=815$

Number of disks were not defective =701

Then , the number of disks which are defective = $815-701=114$

Now, the proportion of disks which are defective : $p=\dfrac{114}{815}\approx0.14$

Significance level : $\alpha: 1-0.9=0.1$

Critical value : $z_{\alpha/2}=1.645$

The confidence interval for population proportion is given by :-

$p\pm\ z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}\\\\=0.14\pm(1.645)\sqrt{\dfrac{(0.14)(1-0.14)}{815}}\\\\\approx0.14\pm0.020=(0.14-0.020,0.14+0.020)=(0.120,0.160)$

Hence, the 90% confidence interval for the population proportion of disks which are defective = (0.120,0.160)

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3 years ago