Question

It was determined that the percentage of​ t's in the English language in the 1800s was...

It was determined that the percentage of​ t's in the English language in the 1800s was 99​%. A random sample of 500 letters from a current newspaper contained 64 ​t's. Test the hypothesis that the proportion of​ t's has changed in modern​ times, using the 0.05 level of significance. Treat the newspaper as a random sample of all letters used. Z=? P Value=?

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
In a previous​ year, 51​% of females aged 15 and older lived alone. A sociologist tests...
In a previous​ year, 51​% of females aged 15 and older lived alone. A sociologist tests whether this percentage is different today by conducting a random sample of 550 females aged 15 and older and finds that 287 are living alone. Is there sufficient evidence at the alphaequals0.01 level of significance to conclude the proportion has​ changed? Because np 0 left parenthesis 1 minus p 0 right parenthesisequals nothing ▼ greater than less than not equals equals ​10, the sample...
According to MessageLabs Ltd., 80% of all email sent in July 2010 was spam. A system...
According to MessageLabs Ltd., 80% of all email sent in July 2010 was spam. A system manager at a large corporation believes that the percentage at his company may be greater than 80%, and he wants to do a hypothesis test to see if there is evidence to support his belief. He examines a random sample of 500 emails received at an email server and finds that 420 of the messages are spam. What is the parameter for this hypothesis...
five-year-old census recorded that 20% of the families in a large community lived below the poverty...
five-year-old census recorded that 20% of the families in a large community lived below the poverty level. To determine whether this percentage has changed, a random sample of 400 families is studied and 80 are found to be living below the poverty level. 1.Construct a 98% confidence interval for the percentage of families earning income below the poverty level. 2.Does this finding indicate that the current percentage of families earning income below the poverty level has changed from what it...
Several years ago, a group of Honda Dealerships determined that the average amount of days automobiles...
Several years ago, a group of Honda Dealerships determined that the average amount of days automobiles stay on dealers' lots was equal to 22.1 days. They now believe that the mean time has changed and would like to test their belief at a significance level of 0.05. Results of a sample of 50 cars on various lots can be found in the file Honda Hypothesis Test. Use this information to answer the next several questions and ultimately decide whether or...
A survey conducted five years ago by the health center at a university showed that 18%...
A survey conducted five years ago by the health center at a university showed that 18% of the students smoked at the time. This year a new survey was conducted on a random sample of 200 students from this university, and it was found that 50 of them smoke. We want to find if these data provide convincing evidence to suggest that the percentage of students who smoke has changed over the last five years. What are the test statistic...
The alternative hypothesis is H1: p < 0.15, and the test statistic is z= -1.37 ....
The alternative hypothesis is H1: p < 0.15, and the test statistic is z= -1.37 . Find p-value of the large sample one proportion z-test. Find critical value t a/2 for a one sample t test to test H1: μ   ≠ 5 at a significance level a=0.05 and degrees freedom = 15. A company wants to determine if the average shearing strength of all rivets manufactured is more than 1000 lbs. A sample of 25 rivets is selected and tested...
According to 2017 US Census data, 23% of Kentucky adults age 25 and older have a...
According to 2017 US Census data, 23% of Kentucky adults age 25 and older have a bachelor’s degree or higher. You suspect that percentage has decreased. You find in a random sample of 900 Kentuckians age 25 and older that 199 have a bachelor’s degree. Use this prompt for the next five questions to conduct a hypothesis test at the α=0.05 significance level to determine if the percent of Kentuckians with a college degree has decreased since 2017. a) State...
A newspaper conducted a statewide survey concerning the 1998 race for state senator. The newspaper took...
A newspaper conducted a statewide survey concerning the 1998 race for state senator. The newspaper took a simple random sample of n = 1100 registered voters and found that 570 of those voters would vote for the Republican candidate. Let p represent the proportion of all registered voters in the state who would vote for the Republican candidate. We test the following hypotheses using a significance level of α = 0.05: H0 : p = 0.50 Ha : p >...
i. A researcher estimated the proportion of voters who favor the Democratic candidate in an election....
i. A researcher estimated the proportion of voters who favor the Democratic candidate in an election. Based on 500 people she calculates the 95% confidence interval for the population proportion p:   0.123 <p<0.181. Which of the following is a valid interpretation of this confidence interval ?______ a. There is a 95% chance that the true value of p lies between 0.123 and 0.181 b.   If many different samples of 500 were selected and a confidence interval was constructed based on...
15% of all Americans suffer from sleep apnea. A researcher suspects that a higher percentage of...
15% of all Americans suffer from sleep apnea. A researcher suspects that a higher percentage of those who live in the inner city have sleep apnea. Of the 314 people from the inner city surveyed, 50 of them suffered from sleep apnea. What can be concluded at the level of significance of αα = 0.05? For this study, we should use Select an answer t-test for a population mean z-test for a population proportion The null and alternative hypotheses would...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT