opose a computer chip manufacturer finds that 20% of the chips produced during the velopment phase of a new chip fail testing. Assume the failures are independent. What is the obability that that 5 or more chips will fail test out of the next 20 tested? ter your answer as 0.XXXX accurate to the 4th decimal place.

A researcher claims that at least 10% of all football helmets have manufacturing flaws that could potentially cause injury to the wearer. A sample of 200 helmets revealed that 16 helmets contained such defects. Does this finding support the researcher's claim? Use a = 0.03. Find the P-value. The proportion of football helmets with flaws The P-value is i ✓ 10%. . Round your answer to four decimal places (e.g. 12.3456).

The post-lunch dip is the drop in mental alertness after a midday meal. Does an extract of the leaves of the ginkgo tree reduce the post-lunch dip? Assign healthy people aged 18 to 40 years to take either ginkgo extract or a placebo pill. After lunch, ask them to read seven pages of random letters and place an X over every e. Count the number of misses per line read. M. K. Pawlik, "The effect of ginkgo biloba on the post-lunch dip and chemosensory function," MS thesis, Purdue University, 2002. What is a placebo and why was one group given a placebo? A placebo is a treatment pill that is presented to the individuals as a control treatment. A placebo is a lower-strength version of the pill that allows researchers to account for any physiological effect of taking the pill. O A placebo is an inert pill that allows researchers to account for any psychological effect of taking the pill. A placebo is a different pill that allows researchers to account for any variational effect of taking the…

The worldwide market share for a web browser was 20.5​% in a recent month. Suppose that a sample of 200 random students at a certain university finds that 50 use the browser.   Calculate the test statistic.   ZSTAT=______ ​(Type an integer or a decimal. Round to two decimal places as​ needed.)

d. There is a 30% chance that X is above what value? X= (Type an integer or decimal rounded to two decimal places as needed.)

A federal report indicated that 28% of children under age 6 live in poverty in Kentucky, an increase over previous years. How large a sample is needed to estimate the true proportion of children under age 6 living in poverty in Kentucky within 5% with 90% confidence? Round the intermediate calculations to three decimal places and round up your final answer to the next whole number. n =

Many college and university students obtain summer jobs. A professor wanted to determine whether students in different degree programs earn different amounts. She randomly selected five students in each of the 5 university programs and asked them to report what they earned the previous summer (in thousands of dollars). The following partially filled in ANOVA table was obtairned. Fill-in the rest of the table. (Use exact values for df and round all other nurmbers to 2 decimal places, if needed) Source SS MS F-Stat JP. Treatments 11.8 Error Total 25.6 Check

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A large automobile insurance company selected samples of single and married male policyholders and recorded the number who made an insurance claim over the preceding three-year period.   Single Policyholders Married Policyholders  n1=550  n2=1,000 Number making claims = 110 Number making claims = 150   a. Use a=0.05 Test to determine whether the claim rates differ between single and married male policyholders. z-value  (to 2 decimals) p-value  (to 4 decimals)   b. Provide a 95% confidence interval (to 4 decimals) for the difference between the proportions for the two populations. Enter negative answer as negative number. (  ,   )

Express each of your first five answers as a decimal and round to the nearest 0.001 (in other words, type 0.123, not 12.3% or 0.123456).What fraction of survey respondents identified themselves as Democrats? What fraction of survey respondents thought the economy was getting better? What fraction of Democrats thought the economy was getting better?