The purity of gold is listed in karats. If a necklace is 75% what karat is it
1 answer:
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Answer:
A) x=5 or -11
Step-by-step explanation:
The given equation is:
The most suitable method so solve this quadratic equation is the square root method.
We take square root of both sides to obtain:
We now split the plus or minus sign to get;
This simplifies to:
The correct choice is A
Answer:
If we compare the p value obtained and the significance level assumed we see that
so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 5% of significance the proportion is not significantly higher than 0.2 or 20%.
Step-by-step explanation:
How would you make the decision if you were Callaway management? Would you use hypothesis testing?
The best way to test the claim if with a proportion test. The procedure is explained below.
1) Data given and notation
n=624 represent the random sample taken
X=140 represent the golf ball purchasers will buy a Callaway golf ball
estimated proportion of golf ball purchasers will buy a Callaway golf ball
is the value that we want to test
represent the significance level
z would represent the statistic (variable of interest)
represent the p value (variable of interest)
2) Concepts and formulas to use
We need to conduct a hypothesis in order to test the claim that the true proportion is more than 0,2 or 20%:
Null hypothesis:
Alternative hypothesis:
When we conduct a proportion test we need to use the z statistic, and the is given by:
(1)
The One-Sample Proportion Test is used to assess whether a population proportion is significantly different from a hypothesized value
.
3) Calculate the statistic
Since we have all the info requires we can replace in formula (1) like this:
4) Statistical decision
It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.
The significance level is not provided but let's assume . The next step would be calculate the p value for this test.
Since is a right tailed test the p value would be:
If we compare the p value obtained and the significance level assumed we see that
so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 5% of significance the proportion is not significantly higher than 0.2 or 20%.